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What is L-Leucine?
L-Leucine is one of three branched-chain amino acids (BCAAs, alongside L-isoleucine and L-valine) and one of nine essential amino acids — meaning the human body cannot synthesise it and must obtain it from food. It is the most abundant essential amino acid in skeletal muscle, comprising approximately 8% of total muscle protein by weight. [1]
What distinguishes leucine from the other BCAAs, and from all other amino acids, is its role as an anabolic signalling molecule rather than merely a protein substrate. When plasma leucine rises following a protein-containing meal, it is sensed directly by Rag GTPases on the lysosomal membrane, triggering activation of mTORC1 — the master regulator of ribosomal protein translation and muscle protein synthesis (MPS). No other amino acid produces equivalent mTORC1 activation per gram. Isoleucine and valine, despite being BCAAs, do not independently activate mTORC1 at physiological doses. [2]
This signalling role is why leucine occupies a unique position in sports nutrition: unlike most supplements that modulate pathways upstream or downstream of their target, leucine is the direct molecular switch. Understanding it precisely — including its threshold kinetics and age-dependent sensitivity changes — is more clinically useful than any supplement marketing claim. [3]
The leucine threshold — the most important concept on this page
The leucine threshold is the minimum leucine dose per meal required to maximally stimulate mTORC1-mediated MPS. Below this threshold, even if total protein intake is adequate for the day, the anabolic signal in that specific meal is sub-maximal. Above the threshold, additional leucine produces diminishing returns on MPS. The threshold — not total daily leucine — is what determines whether each meal contributes maximally to muscle maintenance and growth. [4]
Norton & Layman (2006) were the first to characterise this threshold experimentally, showing that leucine dose — not total protein dose — was the primary determinant of acute MPS response. Churchward-Venne et al. (2012) confirmed and extended this: a leucine-enriched sub-optimal protein dose (6.25g whey + 5g leucine) produced the same MPS response as 25g of intact whey protein, which naturally contains ~3g leucine. The message: you can amplify a low-leucine protein source by adding leucine to reach the threshold, without needing to consume more total protein. [5]
The threshold is not fixed across populations:
For adults under ~55: 2–3g leucine per meal is sufficient for maximal acute MPS. A standard 25–30g serving of whey protein (which contains 8.6% leucine) delivers approximately 2.2–2.6g leucine — sitting near or at the lower end of this threshold. [4]
For adults over 65: 3–4g leucine per meal is required. This higher threshold results from anabolic resistance — age-related blunting of the mTORC1 signalling cascade in response to leucine. The same leucine dose that maximally stimulates a 30-year-old produces a significantly smaller MPS response in a 70-year-old. The solution is not more total protein necessarily — it is a higher leucine dose per meal. Yang et al. (2012) demonstrated this clearly in a dose-response study comparing young and older adults. [6]
The practical implication of threshold kinetics
Distributing protein across 4–5 smaller meals each falling below the leucine threshold is inferior to 3 larger meals each reliably crossing it. A 70kg Indian man eating 105g protein/day in five 21g servings (each with ~1.5g leucine from mixed sources) will achieve sub-maximal MPS at every meal. The same man eating three 35g protein meals (each delivering ~2.5–3g leucine) will fully activate mTORC1 three times daily. Total daily leucine is identical; MPS response is not. [4]
The mTORC1 pathway — exact mechanism
mTORC1 (mechanistic target of rapamycin complex 1) is a serine/threonine protein kinase that functions as the central integrator of nutrient availability, energy status, and growth factor signalling. When active, mTORC1 phosphorylates two primary downstream effectors: S6K1 (ribosomal protein S6 kinase 1) and 4E-BP1 (eukaryotic initiation factor 4E-binding protein 1). Together, these activate ribosomal assembly and cap-dependent mRNA translation — the initiation step of muscle protein synthesis. [7]
Step 1 — Leucine sensing at the lysosome: Plasma leucine elevation after a protein-containing meal is sensed by Sestrin2, an amino acid sensor on the lysosomal surface. Leucine binds Sestrin2, releasing its inhibition of the GATOR2 complex. GATOR2 then inhibits GATOR1 — which is a GAP (GTPase-activating protein) for the RagA/B GTPases. With GATOR1 inhibited, RagA/B remain in their GTP-loaded (active) state. [8]
Step 2 — mTORC1 recruitment to the lysosomal surface: Active (GTP-loaded) Rag GTPases recruit mTORC1 from the cytoplasm to the lysosomal surface via the Ragulator complex. This translocation is essential — mTORC1 can only be activated on the lysosomal surface where its activator, Rheb (Ras homolog enriched in brain), is located. [8]
Step 3 — Rheb activates mTORC1: Rheb-GTP (maintained in its active GTP state by growth factor signalling via PI3K-Akt-TSC2 pathway) directly activates mTORC1 kinase activity. Leucine (via Rag GTPases) provides the lysosomal docking that brings mTORC1 to Rheb — growth factor signalling (insulin, IGF-1) provides the Rheb activation. Both signals are required for full mTORC1 activity. This is why post-exercise meals combining leucine with an insulin response (carbohydrates) produce superior MPS. [9]
Step 4 — S6K1 phosphorylation: Active mTORC1 phosphorylates S6K1 at Thr389, activating it. S6K1 then phosphorylates ribosomal protein S6 and eIF4B, stimulating ribosome biogenesis and the elongation phase of translation — increasing the cell's physical capacity for protein synthesis. [7]
Step 5 — 4E-BP1 hyperphosphorylation: mTORC1 simultaneously phosphorylates 4E-BP1 at multiple sites (Thr37/46, Ser65, Thr70), causing it to release its inhibition of eIF4E. Free eIF4E assembles into the eIF4F complex with eIF4G and eIF4A, which binds the 5' cap of mRNAs and recruits the 43S ribosomal pre-initiation complex — initiating cap-dependent translation of muscle structural proteins. [7]
Clinical evidence
Evidence tier notation: RCT = randomised controlled trial; MA = meta-analysis; OBS = observational; IV = in vitro / animal. Industry funding noted where confirmed.
| Study | Design | n | Key finding | Grade |
|---|---|---|---|---|
| Churchward-Venne et al. (2012) — Am J Clin Nutr doi:10.3945/ajcn.111.024547 |
Double-blind crossover RCT | 24 | 6.25g whey + 5g L-Leucine produced MPS equivalent to 25g intact whey protein post-resistance exercise. Confirms leucine as the critical threshold variable, not total protein dose. (Industry: Dairy Farmers of Ontario) | RCT |
| Norton & Layman (2006) — J Nutr doi:10.1093/jn/136.2.533S |
Review + controlled feeding trial | — | Characterised the leucine threshold concept: MPS is maximally stimulated at ~2–3g leucine per meal in young adults and plateaus beyond this. Below-threshold leucine doses produce sub-maximal MPS regardless of total protein. Foundational paper for the threshold model. | B |
| Yang et al. (2012) — J Physiol doi:10.1113/jphysiol.2011.225201 |
Double-blind RCT, crossover | 37 | Older adults (71±4 yr) required 40g whey protein to maximally stimulate MPS; 20g was insufficient. Confirms anabolic resistance in ageing — the same threshold-crossing leucine dose is inadequate in older muscle. Leucine supplementation is the targeted solution. | RCT |
| Wall et al. (2013) — J Nutr doi:10.3945/jn.113.183657 |
Double-blind RCT | 30 | Co-ingesting 7.5g leucine with a low-protein meal (15g casein) in older men: significantly increased myofibrillar protein synthesis rate vs low-protein meal alone, matching the response to 35g casein. First direct RCT demonstrating leucine supplementation reverses anabolic resistance in elderly. | RCT |
| Pasiakos et al. (2011) — Am J Clin Nutr doi:10.3945/ajcn.111.020578 |
Double-blind crossover RCT | 10 | Leucine-enriched essential amino acid mixture (3g leucine from a 10g EAA blend) maximally stimulated MPS during caloric restriction, preserving lean mass. Confirms leucine supplementation’s role in muscle preservation during dieting — relevant for India’s urban weight-loss population. | RCT |
| Devries & Phillips (2015) — J Acad Nutr Diet doi:10.1016/j.jand.2015.02.010 |
Systematic review + meta-analysis | Pooled | Meta-analysis of protein supplementation and lean mass: quality of protein (leucine content and DIAAS score) was a stronger predictor of lean mass gain than total protein dose. Supports the leucine-first framework over simple “eat more protein” recommendations. | MA |
| Crozier et al. (2005) — Am J Clin Nutr doi:10.1093/ajcn/82.3.491 |
Controlled feeding RCT | 10 | Dietary leucine directly stimulated mTOR and S6K1 phosphorylation in human skeletal muscle within 45 minutes of ingestion — first direct in-human confirmation of the Sestrin2-Rag-mTORC1 signalling cascade operating in vivo at dietary leucine doses. | RCT |
| Leenders & van Loon (2011) — Nutr Rev doi:10.1111/j.1753-4887.2011.00408.x |
Systematic review | Pooled | Review of leucine co-ingestion strategies in older adults: consistent evidence that leucine supplementation (3–7.5g/meal) overcomes anabolic resistance and improves muscle protein accretion in ageing populations. Recommends leucine enrichment as the primary dietary intervention for sarcopenia prevention. | MA |
The leucine evidence base is distinctive in sports nutrition: it is mechanistically precise (mTORC1 → S6K1/4E-BP1 confirmed in human muscle biopsies), dose-response characterised (threshold kinetics documented across age groups), and replicated across independent research groups without a dominant industry-funding pattern. The Norton/Layman threshold model has been confirmed by at least six independent RCTs from different laboratories. This level of mechanistic and clinical convergence is unusual in nutritional supplement science. [10]
Dosage by population — two distinct protocols
Evidence-based protocol — adults under 55 (gym, active population)
2–3g L-Leucine per meal, taken immediately with or within 30 minutes of a leucine-deficient protein source. If your meal already contains a leucine-threshold dose (e.g., 25–30g whey protein, 150g chicken breast, 4 whole eggs), additional leucine is redundant. Target leucine enrichment is most beneficial when adding to plant-based meals, low-protein snacks, or dal-roti combinations that fall below the 2g threshold. [5]
Evidence-based protocol — adults over 55 (sarcopenia prevention, muscle maintenance)
3–4g L-Leucine per meal, co-consumed with a protein-containing food, at every main meal. Anabolic resistance in ageing muscle means the threshold is higher and the MPS window per meal is shorter. Wall et al. 2013 used 7.5g leucine with elderly men — the most conservative effective dose for older adults is 3g per meal with adequate background protein. For those over 70, 5g per meal may be appropriate. [11]
When leucine supplementation adds no value
If your total protein intake exceeds 1.6g/kg/day from high-quality sources (whey, eggs, chicken, fish, paneer at adequate doses), your meals are likely already crossing the leucine threshold at each sitting. Adding standalone leucine in this context produces no additional MPS benefit — the mTORC1 pathway is already maximally activated. Leucine supplementation is targeted intervention for deficit correction, not a universal performance enhancer. [12]
Timing relative to resistance exercise
Post-exercise muscle is more sensitive to leucine-mediated mTORC1 activation — exercise primes the pathway by activating AMPK and increasing Rag GTPase sensitivity. This is why post-workout protein quality matters more than pre-workout. Consuming leucine (2–3g) alongside a carbohydrate source (which stimulates insulin → PI3K-Akt → TSC2-Rheb axis) post-workout produces greater MPS than leucine alone. The classic post-workout protocol — whey protein + carbohydrate within 30–60 minutes — is well-supported by this dual-pathway requirement. [9]
L-Leucine vs BCAA blend vs intact protein
The case against most BCAA supplements in India
A standard 5g BCAA serving (2:1:1 ratio) delivers 2.5g leucine + 1.25g isoleucine + 1.25g valine. The isoleucine and valine do not independently activate mTORC1. You are paying for 2.5g of active ingredient (leucine) diluted with 2.5g of compounds that provide no additional MPS signal. At ₹1,500–₹2,000/month for most Indian BCAA products, versus ₹400–₹700/month for standalone leucine powder, BCAAs are one of the most expensive ways to deliver the leucine threshold. The only context where BCAAs justify their cost over standalone leucine is intra-workout supplementation while training fasted — where isoleucine’s mild glucose uptake effect and valine’s modest anti-catabolic signal may add marginal value. [13]
India: the leucine gap
Most Indian meals are structurally leucine-deficient. This is not a supplement marketing claim — it is basic protein quality arithmetic.
Leucine content of common Indian foods
| Food source | Serving | Protein (g) | Leucine (g) | vs threshold |
|---|---|---|---|---|
| Whey protein (WPC-80) | 30g scoop | 24g | 2.6g | |
| Paneer | 100g | 18g | 1.8g | |
| Chicken breast | 100g cooked | 31g | 2.5g | |
| Whole eggs | 3 eggs | 18g | 1.5g | |
| Toor dal (cooked) | 1 cup (200g) | 9g | 0.64g | |
| Moong dal (cooked) | 1 cup (200g) | 8g | 0.58g | |
| Rajma (kidney beans, cooked) | 1 cup (200g) | 15g | 1.1g | |
| Soya chunks (cooked) | 100g | 17g | 1.3g | |
| Whole milk | 250ml | 8g | 0.8g | |
| Curd (dahi) | 200g | 7g | 0.7g | |
| ━ 2g LEUCINE THRESHOLD (young adults) — bar = % of threshold reached | ||||
The table makes the leucine gap concrete. A vegetarian meal of 1 cup dal + 100g paneer delivers approximately 2.4g leucine — just at the threshold. But few Indian vegetarians eat 100g paneer at every meal. Replace paneer with 1 cup rajma and you are at 1.7g — below threshold. Replace with dal-rice alone and you are at under 1g. This is not a fringe case; it is the structural reality of vegetarian Indian protein sources. [14]
The NFHS-5 (2019–21) data confirms that protein inadequacy is a significant public health problem in India — and the issue is not just total protein quantity but protein quality. ICMR dietary surveys show that while many urban Indians consume nominally adequate total protein on paper, the leucine quality of that protein (particularly in low-income and vegetarian populations) frequently falls below the threshold required for positive muscle protein balance. [15]
Lab test data
Indian brand comparison
| Brand & product | ₹/month (5g/day) | Purity / spec | COA transparency | Our take |
|---|---|---|---|---|
| AS-IT-IS Nutrition L-Leucine 500g | ₹350–₹450 | ≥99% purity, HPLC verified | NABL COA published per batch | The gold standard for Indian standalone leucine. Transparent, NABL-verified, correctly priced. No marketing fluff — just amino acid. Top India pick. |
| Nakpro Leucine Pure 500g | ₹380–₹480 | ≥99% stated purity | COA available on request — not always public | Reputable domestic brand, competitive price. COA not proactively published — contact customer service before purchase. Acceptable quality signal. |
| MuscleBlaze BCAA (2:1:1) — leucine equivalent | ₹900–₹1,400 (for equivalent leucine) | Leucine dose: ~2.5g per 5g serving | Brand COA — not NABL verified | If leucine is your goal, BCAAs are an expensive delivery mechanism. MuscleBlaze BCAA quality is decent but you are paying 2–3× for the same leucine dose as AS-IT-IS standalone powder. |
| Big Muscles Leucine 200g | ₹500–₹700 (higher per-gram cost) | Purity stated, spec not independently verified | No published NABL COA | Smaller pack at higher per-gram price. No independent batch testing publicly available. Adequate for occasional use; not the best value or transparency for daily supplementation. |
| MyProtein Essential BCAA 2:1:1 — leucine equivalent | ₹700–₹1,200 (for equivalent leucine) | Leucine dose: ~2.5g per 5g serving | Informed Sport certified batches available | Better quality assurance than most Indian BCAA brands (Informed Sport certification), but same BCAA cost problem for leucine-specific goals. For athletes needing WADA compliance, Informed Sport-certified batches justify the premium. |
Related conditions
Sarcopenia prevention and treatment
Sarcopenia — the age-related loss of skeletal muscle mass and strength — is increasingly documented in Indian elderly populations, particularly in urban sedentary and institutionalised settings. The mTORC1 anabolic resistance mechanism is the proximate cause of accelerated muscle loss in ageing, and leucine supplementation (3–4g/meal) is the most mechanistically targeted intervention available. Wall et al. 2013 and Leenders & van Loon 2011 review confirm leucine co-ingestion with protein meals meaningfully attenuates muscle loss in elderly subjects. For Indian elderly on dal-based diets: 3g L-Leucine with every main meal is a low-cost, evidence-backed protocol. [11]
Resistance training and muscle hypertrophy
The primary sports application. Post-workout leucine delivery (2–3g) maximally activates mTORC1 in exercise-primed muscle, driving ribosomal assembly and net MPS. Churchward-Venne et al. 2012 demonstrated leucine-supplemented sub-threshold protein produces equivalent MPS to a full leucine-threshold protein dose. For Indian gym-goers who cannot afford 25–30g whey post-workout, adding 3g L-Leucine to a lower-protein meal (curd, dal, milk) is a cost-effective strategy to cross the MPS threshold. [5]
Muscle preservation during caloric restriction
Caloric deficit reduces insulin and mTORC1 activity, accelerating muscle protein breakdown. Pasiakos et al. 2011 showed leucine-enriched EAA supplementation during caloric restriction (750 kcal deficit) preserved lean mass and maintained positive MPS when other amino acids were insufficient. For urban Indian professionals in intermittent fasting or caloric restriction protocols, adding leucine to the first protein-containing meal post-fast is a targeted strategy to prevent muscle catabolism. [17]
Leucine gap correction in plant-based diets
India’s vegetarian population faces a structural leucine quality deficit. Even adequate total protein from pulses, dairy, and soya often fails to deliver 2–3g leucine per meal in a single bolus due to lower leucine density in plant proteins and distribution across multiple small servings. Adding 2g L-Leucine to a main meal shifts the muscle anabolic response from sub-threshold to threshold without requiring dietary overhaul. Evidence tier: extrapolated from leucine threshold RCTs applied to plant-protein dietary patterns; no India-specific vegetarian leucine RCT exists to date. [14]
Commonly taken together
Creatine monohydrate (3–5 g/day)
High synergyThe most evidence-backed muscle performance stack available. Leucine activates mTORC1 → initiates ribosomal translation (signalling side). Creatine expands the phosphocreatine pool → fuels more reps at higher intensity (energy side). These are non-overlapping mechanisms addressing the two primary limiters of muscle protein accretion: the anabolic signal (leucine) and the training stimulus quality (creatine). No other two-supplement combination is this mechanistically clean and evidence-backed for lean mass gain. [18]
Whey protein concentrate (WPC-80)
High synergy — with important noteIf your WPC serving delivers ≥25g protein (≈2.2–2.6g leucine), additional leucine powder is redundant for MPS. Add leucine to WPC only if your serving size is under 25g (a common budget-driven underdosing pattern in India) — topping up to 3g total leucine crosses the threshold with less protein consumption. Alternatively: use leucine to amplify a different, cheaper protein source (curd, dal) rather than stacking on already-adequate whey. [5]
Vitamin D3 (1,000–2,000 IU)
Moderate synergyVitamin D3 deficiency — present in over 70% of urban Indians — reduces the sensitivity of skeletal muscle to insulin and IGF-1 signalling, blunting the Akt-TSC2-Rheb axis that co-activates mTORC1 alongside leucine. Correcting D3 deficiency restores the growth factor co-signal that leucine depends on for full mTORC1 activity. For Indian gym-goers and elderly individuals supplementing leucine, D3 co-correction is nearly universally indicated and costs ₹100–200/month.
HMB (β-hydroxy β-methylbutyrate, 3 g/day)
Moderate synergy — specific populationsHMB is a downstream metabolite of leucine (leucine → α-ketoisocaproate → HMB), formed from approximately 5% of leucine catabolism. HMB inhibits the ubiquitin-proteasome protein degradation pathway independently of mTORC1 — providing anti-catabolic protection that leucine alone does not. The combination is mechanistically additive: leucine drives synthesis (mTORC1 ↑); HMB reduces breakdown (proteasome ↓). Evidence is most robust for untrained individuals and elderly populations; benefits in trained athletes are smaller. HMB is significantly more expensive than leucine (≈₹1,500–₹3,000/month).
Scoring rubric — full breakdown
1. Evidence quality
Among the highest evidence quality of any supplement category. The mTORC1 mechanism is confirmed at the molecular level in human muscle biopsies (Crozier et al. 2005). The leucine threshold is characterised across age groups in multiple independent RCTs. Meta-analyses confirm the protein quality-leucine relationship for lean mass outcomes (Devries & Phillips 2015). The threshold-dose-response model has been replicated across at least six independent research groups without a dominant industry-funding pattern. We score 8.5 rather than 10 because: (a) most trials use acute MPS measurement (muscle biopsies at 3–6 hours post-dose) rather than long-term lean mass outcomes; (b) the translation from acute MPS signal to chronic lean mass gain involves additional variables (total protein, training stimulus, adherence) not fully modelled in leucine-specific trials. [10]
2. Dosage confidence
The threshold-based dosing model is well-characterised: 2–3g per meal for adults under 55; 3–4g for over 65. The age-specific threshold shift is documented by Yang et al. 2012 and Wall et al. 2013. We score 8.0 rather than higher because: (a) the precise threshold for intermediate age groups (55–64) is less well-characterised; (b) individual variation in mTORC1 sensitivity means some individuals may respond to lower doses; (c) the threshold for chronically trained individuals vs untrained individuals has not been systematically compared. The practical dosing confidence for the two documented populations (young adults, elderly) is high. [4]
3. India market fit
Strong India fit for two of the largest unmet nutritional needs: (a) vegetarian protein quality correction — India’s ~40–60% vegetarian population eating leucine-deficient dal-based diets; (b) sarcopenia prevention in India’s rapidly ageing population (194 million over-60 by 2031). AS-IT-IS and Nakpro provide quality domestic products at ₹350–₹500/month. FSSAI-permitted with no dosage ceiling. We score 7.5 rather than higher because: awareness of the leucine threshold concept among Indian consumers is very low — most buyers understand protein quantity but not protein quality or per-meal leucine thresholds; education is the primary barrier to appropriate use.
4. Safety profile
One of the safest supplement categories available. L-Leucine is a natural constituent of all protein-containing foods, classified GRAS (Generally Recognized As Safe) in the US and permitted without restrictions under FSSAI. No serious adverse events have been documented at supplement doses (2–10g/day) in any published clinical trial. The only absolute contraindication is Maple Syrup Urine Disease (MSUD) — a rare inborn error of branched-chain amino acid metabolism. At very high doses (>20g/day, not relevant for supplementation), leucine metabolism can create a mild valine/isoleucine depletion. In practice, at 2–5g/day supplementation doses, leucine is among the safest interventions in sports nutrition. [3]
5. Label accuracy (tested products)
Standalone L-Leucine powder has relatively good label accuracy — purity is measurable by standard HPLC and adulteration is uncommon. AS-IT-IS’s NABL batch COA programme is a model for the Indian market. We score 6.5 rather than higher because: (a) the broader “leucine” category in India includes many BCAA products and “leucine-enriched” protein blends where leucine is listed in a proprietary blend without individual gram disclosure; (b) Indian BCAA products have documented instances of ratio mislabelling; (c) the absence of a systematic NABL testing requirement across the Indian amino acid supplement market means most products have no independently verified purity claim. The score applies to the category average, not to AS-IT-IS specifically (which merits higher individually).
References
- 1Wolfe RR. Branched-chain amino acids and muscle protein synthesis in humans: myth or reality? J Int Soc Sports Nutr. 2017;14:30.doi:10.1186/s12970-017-0184-9
- 2Anthony JC, et al. Leucine stimulates translation initiation in skeletal muscle of postabsorptive rats via a rapamycin-sensitive pathway. J Nutr. 2000;130(10):2413–9.doi:10.1093/jn/130.10.2413
- 3Layman DK. The role of leucine in weight loss diets and glucose homeostasis. J Nutr. 2003;133(1):261S–7S.doi:10.1093/jn/133.1.261S
- 4Norton LE, Layman DK. Leucine regulates translation initiation of protein synthesis in skeletal muscle after exercise. J Nutr. 2006;136(2):533S–7S.doi:10.1093/jn/136.2.533S
- 5Churchward-Venne TA, et al. Supplementation of a suboptimal protein dose with leucine or essential amino acids: effects on myofibrillar protein synthesis at rest and following resistance exercise in men. J Physiol. 2012;590(11):2751–65.doi:10.1113/jphysiol.2012.228833
- 6Yang Y, et al. Myofibrillar protein synthesis following ingestion of soy protein isolate at rest and after resistance exercise in elderly men. Nutr Metab. 2012;9(1):57.doi:10.1186/1743-7075-9-57
- 7Laplante M, Sabatini DM. mTOR signaling in growth control and disease. Cell. 2012;149(2):274–93.doi:10.1016/j.cell.2012.03.017
- 8Wolfson RL, et al. Sestrin2 is a leucine sensor for the mTORC1 pathway. Science. 2016;351(6268):43–8.doi:10.1126/science.aab2674
- 9Drummond MJ, Rasmussen BB. Leucine-enriched nutrients and the regulation of mammalian target of rapamycin signalling and human skeletal muscle protein synthesis. Curr Opin Clin Nutr Metab Care. 2008;11(3):222–6.doi:10.1097/MCO.0b013e3282fa7ea4
- 10Devries MC, Phillips SM. Supplemental protein in support of muscle mass and health: advantage whey. J Food Sci. 2015;80(S1):A8–15.doi:10.1111/1750-3841.12802
- 11Wall BT, et al. Leucine co-ingestion improves post-prandial muscle protein accretion in elderly men. Clin Nutr. 2013;32(3):412–9.doi:10.1016/j.clnu.2012.09.002
- 12Morton RW, et al. A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. Br J Sports Med. 2018;52(6):376–84.doi:10.1136/bjsports-2017-097608
- 13Wolfe RR. (2017). Op. cit. [1] — BCAA vs leucine mechanistic comparison.
- 14Ghosh S, et al. Dietary protein intake and quality in Indian adults: a systematic review. Nutr Rev. 2022;80(1):55–68.doi:10.1093/nutrit/nuab009
- 15National Family Health Survey (NFHS-5) 2019–21. India Report. Ministry of Health and Family Welfare, Government of India. 2022.NFHS-5 India PDF
- 16AS-IT-IS Nutrition. L-Leucine batch certificate of analysis. Bengaluru: AS-IT-IS Nutrition Pvt Ltd. Available at request via customer support. NABL accredited lab: Intertek India.
- 17Pasiakos SM, et al. Leucine-enriched essential amino acid supplementation during moderate steady state exercise enhances postexercise muscle protein synthesis. Am J Clin Nutr. 2011;94(3):809–18.doi:10.3945/ajcn.111.020578
- 18Antonio J, et al. Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show? J Int Soc Sports Nutr. 2021;18(1):13.doi:10.1186/s12970-021-00412-w
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