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Head-to-head evidence comparison — which supplement is right for you?
B. lactis (BB-12 / HN019) vs Whey Protein: Whey Protein has the stronger overall evidence (9 vs 6/10); the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
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
24 of 28 studies with measurable effects showed benefit.
Top outcomes
1-10 billion CFU daily for BB-12 (1 billion is enough); 10-20 billion CFU daily for HN019 if transit is the goal
any
Capsule or sachet standardized to a named strain (BB-12 or HN019)
20-40g per serving
Post-workout (within 2 hours), Morning, Between meals
Whey Protein Isolate
2 weeks
4 weeks
n/a
n/a
4-8 weeks
24-48 hours post-workout
Immediate
Within hours of consumption
Dose-response effect of Bifidobacterium lactis HN019 on whole gut transit time and functional gastrointestinal symptoms in adults.
Scand J Gastroenterol (2011) · Rct · n=100
Whole-gut transit fell 49 to 21 hours on high dose (p<0.001) and 60 to 41 hours on low dose (p=0.01); placebo unchanged
Eight-Week Supplementation With Bifidobacterium lactis HN019 and Functional Constipation: A Randomized Clinical Trial.
JAMA Netw Open (2024) · Rct · n=229
Primary outcome (change in complete spontaneous bowel movements per week): +0.80 with HN019 vs +0.66 placebo — no difference
Effects of 28-day Bifidobacterium animalis subsp. lactis HN019 supplementation on colonic transit time and gastrointestinal symptoms in adults with functional constipation: A double-blind, randomized, placebo-controlled, and dose-ranging trial.
Gut Microbes (2018) · Rct · n=228
No significant differences vs placebo in the primary outcome (colonic transit time) or any secondary outcome
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 6/10) and wins in 2 of 3 categories.
No known interactions between B. lactis (BB-12 / HN019) and Whey Protein have been documented in our database. However, always consult a healthcare provider before combining supplements.
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The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.