Saccharomyces/Coix Lacryma-Jobi Ferment Filtrate — INCI reference

What it is

Saccharomyces/Coix Lacryma-Jobi Ferment Filtrate is obtained by fermenting the seeds of Coix lacryma-jobi (Job's tears) with Saccharomyces yeast. The fermentation process breaks down complex seed molecules into smaller, bioavailable components, concentrating amino acids that support the skin's Natural Moisturizing Factor and enhancing absorption of antioxidants. The filtrate supplies vitamins, minerals, and polyphenols that help soothe inflammation, support the barrier function, and suppress tyrosinase activity to address uneven skin tone and hyperpigmentation. It is water-soluble, non-comedogenic, and commonly used in toners, essences, serums, and sheet masks, particularly in Korean and Japanese skincare formulations. Suitable for sensitive skin due to its low irritation potential.

Safety & warnings

Generally considered low risk for irritation and sensitization. Non-comedogenic (comedogenicity rating 0). No known phototoxicity. Suitable for sensitive skin. As with any botanical ferment, individuals with yeast sensitivities or allergies to Saccharomyces should perform a patch test before use. No CIR safety assessment specific to this ingredient has been published.

Origin & sourcing

Derived from the seeds of Coix lacryma-jobi (Job's tears), a tropical grass native to Southeast Asia (India, Myanmar, China, Malaysia) cultivated since at least 4000 BC. The seeds are fermented using Saccharomyces (baker's/brewer's yeast) in a controlled biofermentation process that hydrolyzes proteins and polysaccharides into smaller active fractions. The resulting filtrate is the liquid phase separated after fermentation.

History

Job's tears has been used in traditional Chinese medicine for centuries to nourish skin and reduce inflammation. Archaeological evidence places its cultivation in Japan circa 4000 BC and beer brewing in China circa 3000 BC. Its use as a cosmetic ferment filtrate emerged in modern K-beauty and J-beauty formulations, popularized in first essences and watery toners from brands such as SEKKISEI and Hada Labo. The CosIng database lists the ingredient under the function of skin conditioning.

Questions everyone asks

What plant does this ingredient come from?

It comes from Coix lacryma-jobi, commonly called Job's tears, a tropical grass cultivated across East and Southeast Asia for food, medicine, and skincare for thousands of years.

Why is fermentation used to make this ingredient?

Fermenting the seeds with Saccharomyces yeast breaks down large molecules into smaller, more bioavailable fractions, improving skin absorption and concentrating active amino acids, antioxidants, and polyphenols.

What skin types benefit most from this ingredient?

It is suitable for all skin types, including sensitive skin. Its anti-inflammatory and hydrating properties are particularly useful for oily or combination skin seeking lightweight moisture.

Does this ingredient help with dark spots?

Research suggests the filtrate can suppress tyrosinase enzyme activity, which may help reduce melanin synthesis and address hyperpigmentation, though it is typically used as a supporting ingredient rather than a primary brightening agent.