What does Lactobacillus acidophilus LA-14 do?

Probiotic strain with early evidence for immune support; most studies use it in multi-strain blends.

Is Lactobacillus acidophilus LA-14 safe?

All human studies used LA-14 in multi-strain blends — benefits cannot be attributed to this strain alone

Lactobacillus acidophilus LA-14 - Science-Based Research

What the Science Says

Lactobacillus acidophilus LA-14 is a specific strain of beneficial bacteria commonly used in probiotic supplements. In the provided studies, it was used as part of multi-strain probiotic blends that showed reductions in inflammatory markers like TNF-α and IL-6 in people with rheumatoid arthritis, and a faster IgG immune response following oral vaccination in healthy adults. Lab research also suggests it carries an enzyme that may help break down oxalate, a compound linked to kidney stones, though this has not been confirmed in human trials.

What It Doesn't Do

Not proven to work on its own — every human study used it in a multi-strain blend, so you can't credit LA-14 alone. No evidence it treats or cures rheumatoid arthritis. No proof it prevents kidney stones in humans. No solid evidence for weight loss, despite one study linking gut bacteria to obesity markers. Don't expect it to replace medications.

Evidence-Based Benefits

Lactobacillus acidophilus LA-14 is a specific strain of beneficial bacteria commonly used in probiotic supplements. In the provided studies, it was used as part of multi-strain probiotic blends that showed reductions in inflammatory markers like TNF-α and IL-6 in people with rheumatoid arthritis, and a faster IgG immune response following oral vaccination in healthy adults. Lab research also suggests it carries an enzyme that may help break down oxalate, a compound linked to kidney stones, though this has not been confirmed in human trials.

Weak Evidence

Effective at: No established dose from provided studies alone; used at 10^9 CFU/day in multi-strain blends

Source: auto-research

Absorption & Bioavailability

Moderate — one study confirmed probiotic strains can survive simulated gastro-intestinal passage at adequate doses, but survival rates vary by dose and formulation. LA-14 specifically was not isolated for survival testing in the provided papers.

Red Flags to Watch For

All human studies used LA-14 in multi-strain blends — benefits cannot be attributed to this strain alone
No standalone RCTs for LA-14 were found in the provided data; evidence is largely indirect
Many products in the NIH DSLD database contain this strain, but high product count does not equal proven efficacy
Lab findings (e.g., oxalate breakdown) have not been validated in human clinical trials

Research Sources

PubMed
NIH DSLD