Probiotics and collagen: what the research does and doesn't show

The evidence doesn't support the idea that probiotics and collagen work better together. We searched PubMed for human trials that gave a probiotic with collagen and found none to report. The pair is sold as a combination, but that is a product category, not a research result.

What the evidence doesn't support

It doesn't support a claim that a collagen-and-probiotic product does more for skin, joints, gut or hair than either ingredient alone, and it doesn't support a claim that collagen "feeds" or protects a probiotic. We found no human trial testing the two together, so there is no result to report: no dose, no duration, no outcome. Collagen on its own and probiotics on their own have separate literatures, and a combination can't borrow either.

The probiotic half has a specific problem. A review of 249 trials across probiotic uses found that effects are strain-specific and purpose-specific and that many products have no trial of their own. A product that says "probiotic" and prints no strain codes can't be matched to any trial, whatever else is in the scoop.

What the research does tell you

The research tells you how to read a combination label. Take the two halves separately:

• The probiotic: look for named strains with codes (a genus, species and strain, not just species), the CFU count, and whether the count is stated at manufacture or through the end of shelf life. A trial result belongs to a strain at a dose, so a label that doesn't give both has nothing a trial could be matched to.
• The collagen: look for the amount per serving in grams and the source; a "proprietary blend" that doesn't give the collagen amount is not comparable with anything.
• The claim: a combination claim needs a combination trial. If the brand cites a study, check that the study gave both ingredients, at the amounts on the label.

Customer reviews, including the "reviews" in keywords like "probiotics collagen protein reviews," are opinions about taste, mixing and price. They can't tell you what a product does; only a controlled trial can.

Probiotic effects are strain-specific, so a result for one named strain is not a result for "probiotics" in general, and a product that lists species without strain codes can't borrow it. See what the research shows across probiotics and how to choose a probiotic.

Questions people ask

Do probiotics and collagen work together?

No trial we found tested them together, so there is no evidence that they do. Each has its own literature, and neither can be assumed to carry over.

Can I take collagen and probiotics at the same time?

We found no study showing a problem or a benefit from taking them at the same time. For timing with meals, see best time to take probiotics, and follow the directions on each label.

Are probiotic collagen protein powders worth it?

That depends on whether you want the protein, and on whether the probiotic has named strains and a count. As a probiotic dose, a powder with no strain codes can't be matched to a trial. See probiotics and protein for the one trial of a probiotic strain added to protein.

When to talk to a doctor

If you take prescription medication, are pregnant or nursing, have a weakened immune system or a medical condition, or are under 18, ask a doctor or pharmacist before adding any supplement (see who should not take probiotics). Nothing here is a reason to change or skip anything a doctor has recommended.