Lactococcus acidophilus

Best for

Prevent diarrhea from antibiotics

Faint early signal for 2 weeks · 1 study , n=82

3 papers · 3 claims · 5 outcomes scored · 2 positive

Outcomes

What lactococcus acidophilus actually does, by outcome

Each row is one outcome with effect size, evidence base, the dose that worked in trials, and time to first effect. Magnitude tiers come from native-unit MCID where available, Cohen's d otherwise.

Outcome Effect size Evidence Dose Weeks Rank

Reduce diarrhea and recover faster Faint early signal

Fewer loose stools, shorter episodes, and less fluid loss.

2 meta-analyses n=826 2000000000 other 2 wk #10/17

35070839·40548185

small

2 meta-analyses n=826 Meta-analyzed

2000000000 other

2 wk

#10 /17

Prevent diarrhea from antibiotics Faint early signal

Keeps your gut stable while antibiotics do their job.

1 RCT n=82 2000000000 other 2 wk #4/5

40548185

small

1 RCT n=82

2000000000 other

2 wk

#4 /5

Ease irritable bowel symptoms Not enough research

Less pain, bloating, and unpredictable bowel habits from IBS.

1 meta-analysis n=— — —

37686889

—

1 meta-analysis n=— Meta-analyzed

—

Outcome	Effect	Evidence	Dose	Weeks	Rank
Reduce diarrhea and recover faster Faint early signal	small	2 meta-analyses n=826 Meta-analyzed	2000000000 other	2 wk	#10/17
Prevent diarrhea from antibiotics Faint early signal	small	1 RCT n=82	2000000000 other	2 wk	#4/5
Ease irritable bowel symptoms Not enough research		1 meta-analysis n=— Meta-analyzed	—	—	—

Sources

1. Efficacy and Safety of Lactobacillus acidophilus LA85 in Preventing Antibiotic-Associated Diarrhea: A Randomized, Placebo-Controlled Study. (2025) ↑

Generated August 14, 2026

Lactococcus acidophilus

What lactococcus acidophilus actually does, by outcome

More evidence for Lactococcus acidophilus

The Acid-Loving Ally: How a Century-Old Milk Microbe Keeps Reinventing Itself

Probiotics

Bacillus Coagulans

Lactobacillus rhamnosus

Saccharomyces boullardii

Zinc

Lactococcus acidophilus

More evidence for Lactococcus acidophilus

NewThe Acid-Loving Ally: How a Century-Old Milk Microbe Keeps Reinventing Itself

NewProbiotics

NewBacillus Coagulans

NewLactobacillus rhamnosus

NewSaccharomyces boullardii

NewZinc

The Acid-Loving Ally: How a Century-Old Milk Microbe Keeps Reinventing Itself

Probiotics

Bacillus Coagulans

Lactobacillus rhamnosus

Saccharomyces boullardii

Zinc