LifeSource Vitamins Grass-Fed Whey Protein Isolate — Premium Muscle Support*
Your clean, premium protein for muscle building, rapid recovery, and healthy aging. LifeSource Vitamins Grass-Fed Whey Protein Isolate is sourced exclusively from 100% grass-fed, pasture-raised cattle — never exposed to feedlots, hormones, GMOs, or pesticides — delivering 25 g of fast-absorbing whey isolate per serving, naturally rich in BCAAs and 5 g of L-glutamine to fuel muscle growth, post-workout recovery, strength gains, immune resilience, and everyday performance.* Gently cold-processed and filtered to preserve nutrient integrity, this high-quality formula supports lean muscle maintenance, satiety, and overall wellness. Crafted in FDA-registered, GMP-certified facilities and 3rd-party tested for purity, potency & label accuracy — so you can trust every scoop.*
Research-Driven & Verified Product.
Explore the clinical research, ingredient science, and global evidence supporting this product below.
Research Promise: At LifeSource Vitamins, our commitment is rooted in research and results. Every benefit below is supported by human clinical studies indexed in the National Institutes of Health (NIH) via PubMed, with full texts available in the National Library of Medicine (NLM) PubMed Central (PMC) when available. We also reference reviews from 39 leading health organizations and insights from 20 top global universities to keep our guidance aligned with credible science.*
Clinically Studied Benefits (Human Evidence)
✓ Boosts muscle size & strength with training* — Meta-analysis of 49 studies: protein supplementation enhances resistance-training gains; diminishing returns beyond ~1.6 g/kg/day. NIH/PubMed — Morton 2018
✓ Elevates post-exercise MPS (older adults)* — High-whey, leucine-enriched supplement increased postprandial muscle protein synthesis in healthy older subjects. NIH/PubMed — Luiking 2014
✓ Leucine dose matters for MPS* — Human data show leucine dose predicts post-exercise MPS responses in older adults (no single threshold). PMC — Wilkinson 2023
✓ Supports exercise recovery* — Randomized trial: protein groups showed benefits across muscle damage, inflammation, and DOMS vs water after eccentric exercise. NIH/PubMed — Nieman 2020
✓ Improves outcomes in sarcopenia* — RCT/meta evidence: whey protein with resistance training increases strength and skeletal muscle mass in older adults with sarcopenia. NIH/PubMed — Cuyul-Vásquez 2023; NIH/PubMed — Li 2024
✓ Maintains benefits after detraining* — Leucine-enriched whey plus resistance training preserved gains 24 weeks post-training vs training alone. NIH/PubMed — Mori 2022
✓ Rapid digestion → robust anabolic response* — Reviews highlight whey’s faster kinetics and higher leucine driving superior acute MPS vs slower proteins. PMC — Breen & Phillips 2011
✓ Blood-pressure support* — Meta-analysis: whey protein intake significantly reduced systolic BP. NIH/PubMed — Vajdi 2023; PMC — Yang 2019
✓ Glutathione (antioxidant) support* — Human trials show whey proteins increase lymphocyte or plasma glutathione levels. NIH/PubMed — Zavorsky 2007; NIH/PubMed — Micke 2001
✓ Supports recovery performance* — Narrative + experimental data show whey facilitates post-exercise recovery and adaptations. PMC — Cintineo 2018
✓ Protein + training synergy (older adults)* — RCT meta: protein with resistance training improves muscle mass/strength/function vs training alone. NIH/PubMed — Hou 2019; PMC — Nunes 2022
✓ Real-world dosing guidance* — Long-term protein supplementation (1 year) with or without exercise modulates basal/postprandial MPS in older adults. NIH/PubMed — Bülow 2023
Additional Studies Showing Promising Benefits
✓ Body composition support* — Meta-analyses report reductions in body weight/fat mass in overweight/obese with whey protein. PMC — Yang 2019
✓ Immune & inflammatory markers (clinical contexts)* — Whey isolates improved nutritional status, glutathione, and select immune markers in patients; contextual adjunct. NIH/PubMed — Bumrungpert 2018
✓ Timing after exercise* — Review: several studies indicate whey post-exercise facilitates recovery via increased protein synthesis. PMC — Kim 2017
✓ Protein type comparisons* — RCT in trained females found no performance difference between whey and casein over 8 weeks; both effective with training. PMC — Wilborn 2013
✓ MPS regulation models* — Systematic review reevaluates the “leucine trigger” concept; overall supports leucine’s role yet notes individual variability. NIH/PubMed — Zaromskyte 2021
✓ Blend/dose explorations* — Whey-dominant blends raise myofibrillar protein synthesis at rest and after exercise in young men. NIH/PubMed — Aussieker 2025
University Studies (Promising — Human / Academic Research)
✓ Age-related anabolism* — Academic review synthesizes variables regulating anabolic resistance with age and the role of protein quality (whey, leucine). PMC — Deane 2024
✓ Protein intake & training meta-overview* — University-led meta-analyses summarize consistent lean-mass benefits with added protein during RET. PMC — Nunes 2022
✓ Older-adult dosing* — Research centers show leucine-enrichment of whey improves MPS in older populations. NIH/PubMed — Luiking 2014
✓ Recovery physiology* — University groups report improved post-exercise recovery/performance metrics with protein strategies. PMC — Cintineo 2018
Global Evidence & Authoritative Reviews
✓ Dietary protein & RET guidance* — Meta-analyses and reviews summarize that additional protein supports RET-induced increases in lean mass/strength. NIH/PubMed — Morton 2018; PMC — Nunes 2022
✓ Healthy aging / sarcopenia* — Evidence base supports protein + resistance training for strength, muscle mass, and mobility in older adults. NIH/PubMed — Li 2024
✓ Blood pressure & lipids* — Systematic reviews find whey may lower SBP and improve select cardiometabolic markers. NIH/PubMed — Vajdi 2023
✓ MPS mechanisms* — Reviews from university groups outline whey’s rapid digestion/leucine advantage vs slower proteins. PMC — Breen & Phillips 2011
✓ Public health context* — Authoritative summaries recommend pairing adequate protein intake with resistance training for functional aging. PMC — Nunes 2022
We monitor research from leading institutions — including Harvard, Johns Hopkins, Mayo Clinic, Cleveland Clinic, Cambridge University, Oxford, Stanford, Yale, MIT, the University of Florida, Oregon State University – Linus Pauling Institute, Tufts, Boston University, Cornell, Columbia, and Ohio State — to ensure our guidance remains aligned with the highest standards of credible science.*
Key Ingredients
-
Grass-Fed Whey Protein Isolate — complete, leucine-rich protein; rapidly digested to stimulate MPS.
-
L-Leucine & BCAAs (naturally occurring) — drive post-exercise MPS responses, especially in older adults.
-
L-Glutamine (naturally occurring) — contributes nitrogen for recovery; whey intake elevates glutathione markers in clinical contexts.
Brief Benefit Bullets
- Builds & maintains lean muscle with training*
- Speeds post-workout recovery*
- Supports healthy aging & mobility*
- Helps maintain healthy blood pressure (as part of a healthy diet)*
- Supports antioxidant defenses via glutathione*
Suggested Use
Adults: Mix 1 scoop (~39 g) with 6–8 oz cold water or milk. Consume pre or post-workout and/or to help meet daily protein goals. Label guidance: Women — 1 heaping scoop (≈25 g protein/≈5 g L-glutamine) in 8 oz liquid, 1–3×/day. Men — 2 heaping scoops (≈50 g protein/≈10 g L-glutamine) in 8 oz liquid, 1–3×/day. Contains milk.
Product Specifications
Serving Size — 1 scoop (39 g)
• Protein — 25 g per scoop (naturally occurring BCAAs & L-glutamine ≈10 g per 2 scoops)
• Ingredients — Cross Filtered Whey Protein Isolate, L-Glutamine, Natural Cocoa (Chocolate only) & French Vanilla Flavoring, Stevia
• Contains — Milk
• Free From — Hormones, rBGH, GMOs, pesticides*
• Processing — Cold-processed/filtered to preserve quality
• Quality — Third-party tested for identity, potency & purity
LifeSource Vitamins — Proudly American — Since 1992
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Grass-Fed Whey Protein Isolate — premium protein for muscle, recovery, and healthy aging. Clinically Studied Ingredients — NIH/PubMed!*
