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Saccharomyces/Xylinum/Black Tea Ferment is known as Kombucha. Kombucha itself is a type of yeast, although it is most commonly used — and ingested — in fermented tea form that is fermented over the course of a few days with sugar. Companies such as emerginC and Oak Bay Naturals have released product lines that market kombucha as a key, active ingredient (alongside an array of other active ingredients, including tea).
It’s said to boost skin immune function and assist in restoring volume to deficient zones in the skin. No clinical, peer-reviewed studies had been conducted testing kombucha’s effects on the skin or hair.

The only case report addressing topical kombucha dealt with a patient who had developed cutaneous anthrax. The report, which was published in the Journal of the American Medical Association in 1998, surmised that the topical kombucha may have provided a medium for bacterial growth.

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