Ingredients

Probiotics and Postbiotics

Written by Reviewed by the SYNC editorial team Published Last reviewed Editorial standards

Probiotics and Postbiotics — microbiome-focused ingredients where probiotics refer to beneficial microorganisms and postbiotics to the beneficial byproducts of those microbes, both used to support the skin's natural balance. In cosmetics, most "probiotic" formulas actually rely on inactivated bacteria or their lysates and ferments rather than live cultures. They are studied for helping soothe and strengthen the skin barrier.

Key points

  • The skin microbiome is the community of microorganisms living on the skin that contributes to barrier function and defense.
  • Most shelf-stable skincare uses postbiotics, such as ferments and bacterial lysates, rather than live probiotic organisms.
  • These ingredients are studied for supporting barrier resilience and helping calm the appearance of sensitive or reactive skin.
  • Truly live probiotics are difficult to keep viable in cosmetic formulas, which is why postbiotic derivatives are more common.

Frequently asked

What is the difference between probiotics and postbiotics in skincare?

Probiotics are beneficial live microorganisms, while postbiotics are the useful byproducts they leave behind, such as ferments and lysates, which are more stable in cosmetics.

Do probiotic skincare products contain live bacteria?

Usually not; most contain inactivated bacteria, lysates, or ferments, because keeping live cultures viable in a preserved cosmetic formula is very challenging.

Related topics

This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.

Encyclopedia

Further reading

This entry was written and checked against the sources below. They are published by clinical and scientific bodies, they are listed most readable first, and each one opens in a new tab. They are background for the whole entry rather than footnotes to individual sentences.

  1. Probiotics: Usefulness and Safety NCCIH (NIH) Clinical guidance nccih.nih.gov
  2. Microbiome and Postbiotics in Skin Health PubMed Central Peer-reviewed, open access pmc.ncbi.nlm.nih.gov
  3. Oral and Topical Probiotics and Postbiotics in Skincare and Dermatological Therapy PubMed Central Peer-reviewed, open access pmc.ncbi.nlm.nih.gov
  4. Impact of prebiotics and probiotics on skin health PubMed Peer-reviewed (abstract) pubmed.ncbi.nlm.nih.gov
  5. Oral and Topical Probiotics and Postbiotics in Skincare ... PubMed Peer-reviewed (abstract) pubmed.ncbi.nlm.nih.gov

SYNC does not publish medical advice. Nothing here replaces a consultation with a doctor or a pharmacist about your own skin.