Lactobacillus/Rye Flour Ferment



Lactobacillus/Rye Flour Ferment description

_Lactobacillus_ rye flour ferment is a non-living probiotic made by fermenting rye flour with the microorganism _Lactobacillus_ that’s used to create sourdough bread. In cosmetics, it works as a humectant to draw and hold moisture to skin, helps to balance the natural flora that populate skin’s surface, aids in visibly repairing skin’s barrier, improves signs of dry skin conditions, and can have a calming action. As probiotic _Lactobacillus_ rye flour ferment breaks down on skin, it creates lactic acid, a postbiotic ingredient with many benefits for skin.

Lactobacillus/Rye Flour Ferment references

  • Journal of the European Academy of Dermatology and Venereology, December 2016, pages 2,038-2,047
  • PLoS One, February 2016, ePublication; and April 2014, ePublication
  • SOFW Journal, March 2014, pages 2-9

Peer-reviewed, substantiated scientific research is used to assess ingredients in this dictionary. Regulations regarding constraints, permitted concentration levels and availability vary by country and region.

Ingredient ratings


Proven and supported by independent studies. Outstanding active ingredient for most skin types or concerns.


Necessary to improve a formula's texture, stability, or penetration.


Generally non-irritating but may have aesthetic, stability, or other issues that limit its usefulness.


There is a likelihood of irritation. Risk increases when combined with other problematic ingredients.


May cause irritation, inflammation, dryness, etc. May offer benefit in some capability but overall, proven to do more harm than good.


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Not rated

We have not yet rated this ingredient because we have not had a chance to review the research on it.