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Head-to-head evidence comparison — which supplement is right for you?
Whey Protein wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mostly mechanism / observational
Top outcomes
Verdict
Likely helps
26 of 30 studies with measurable effects showed benefit.
Top outcomes
1-4g krill oil daily (delivering roughly 0.3-0.9g combined EPA+DHA)
with-meals
Krill oil softgels (phospholipid omega-3)
20-40g per serving
Post-workout (within 2 hours), Morning, Between meals
Whey Protein Isolate
4-12 weeks
3-6 months
Weeks to months
Soon after dosing
4-8 weeks
24-48 hours post-workout
Immediate
Within hours of consumption
Krill oil improved osteoarthritic knee pain in adults with mild to moderate knee osteoarthritis: a 6-month multicenter, randomized, double-blind, placebo-controlled trial.
Am J Clin Nutr (2022) · Rct · n=235
235 adults, 6-month double-blind placebo-controlled multicenter RCT
Clinical effectiveness of krill oil supplementation on cardiovascular health in humans: An updated systematic review and meta-analysis of randomized controlled trials.
Diabetes Metab Syndr (2023) · Meta analysis · n=1458
14 RCTs (18 treatment arms), 1,458 participants
Lipid-modifying effects of krill oil in humans: systematic review and meta-analysis of randomized controlled trials.
Nutr Rev (2017) · Meta analysis · n=662
7 RCTs (14 treatment arms), 662 participants
Comparative Efficacy of Different Protein Supplements on Muscle Mass, Strength, and Physical Indices of Sarcopenia among Community-Dwelling, Hospitalized or Institutionalized Older Adults Undergoing Resistance Training: A Network Meta-Analysis of Randomized Controlled Trials
Nutrients (2024) · Meta analysis · n=5272
Treatment effects for main outcomes were expressed as standard mean difference (SMD) with 95% confidence interval (CI).
Effects of Whey Protein, Leucine, and Vitamin D Supplementation in Patients with Sarcopenia: A Systematic Review and Meta-Analysis
Nutrients (2023) · Meta analysis · n=637
However, appendicular muscle mass significantly improved in the experimental group compared to the control group.
A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength
British Journal of Sports Medicine (2018) · Meta analysis · n=1863
Protein supplementation increases muscle mass gains
Based on multiple meta-analyses with >3000 participants. Effects require concurrent resistance training. Benefits plateau around 30-40g per serving. Isolate forms may reduce digestive issues.
AI-estimated from published studies. Interpret as directional guidance.
Whey Protein has a higher evidence score (9/10 vs 6.5/10) and wins in 2 of 3 categories.
No known interactions between Krill Oil and Whey Protein have been documented in our database. However, always consult a healthcare provider before combining supplements.