Save $25 off $125+ Code: NOV25
Save $25 off $125+ Code: NOV25
Save $25 off $125+ Code: NOV25
Also Available in 1.1 lb size! & 6lb Size
Only 5 Ingredients: Cross Filtered Whey Protein, L-Glutamine, Natural Cocoa, French Vanilla and Stevia.
Read Below: Full Description, Clinical Studies & Research on Whey Protein.
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Grass-Fed Whey Protein Isolate — Double Chocolate Fudge — 3 lbs — Premium Muscle Support*
LifeSource Vitamins Grass-Fed Whey Protein Isolate is a premium, cold-processed formula designed for athletes, healthy aging, and everyday wellness.* Sourced exclusively from 100% grass-fed, pasture-raised cattle — never exposed to feedlots, hormones, antibiotics, GMOs, or pesticides — this clean protein delivers 25 g of fast-absorbing whey isolate per serving, naturally rich in BCAAs and 5 g of L-glutamine to fuel muscle growth, speed recovery, and support immune resilience.* Each batch is gently filtered to preserve nutrient integrity, crafted in FDA-registered, GMP-certified facilities, and 3rd-party tested for purity, potency, and label accuracy — so you can trust what’s inside every scoop.*
• 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; open access summary: 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)
• 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)
• 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)
• 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)
• 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*
• 3rd-party lab tested for identity, potency & purity
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.
• Serving Size — 1 scoop (39 g)
• Servings Per Container — ~35
• Protein — 25 g per scoop (amino acid profile on label; naturally occurring BCAAs & L-glutamine ≈10 g per 2 scoops)
• Ingredients — Cross Filtered Whey Protein Isolate, L-Glutamine, Natural Cocoa & French Vanilla Flavoring, Stevia
• Contains — Milk
• Free From — Hormones, antibiotics, rBGH, GMOs, pesticides*
• Processing — Cold-processed/filtered to preserve quality
• Quality — Third-party tested
• Athletes & lifters focused on muscle & recovery*
• Adults seeking healthy aging, strength, and mobility support*
• Clean-label, grass-fed protein consumers
Whey Protein Isolate (grass-fed) — complete, leucine-rich protein; rapidly digested to stimulate MPS. (PMC — Breen & Phillips 2011)
L-Leucine & BCAAs (naturally occurring) — drive post-exercise MPS responses, especially in older adults. (PMC — Wilkinson 2023)
L-Glutamine (naturally occurring) — contributes nitrogen for recovery; whey intake elevates glutathione markers in clinical contexts. (PubMed — Zavorsky 2007)
3rd-Party Testing: Every batch is verified by independent labs for identity, potency, and purity. Click here to see our 3rd-party testing.
*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!*

*Disclaimer: 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. Always consult your physician before taking any supplements. Individual results may vary. This information is not intended to replace your healthcare provider but to support and enhance that relationship. You are encouraged to do your own research and take an active role in your health decisions. If you are pregnant, nursing, taking medications, or have any medical conditions, consult your healthcare professional before using any supplements discussed on this site.