Biology's best-kept secret was never a secret. It was monthly.

Stem cells from menstrual blood

Muse Bio turns an overlooked, renewable resource into real value. From menstrual blood, we isolate stem cells and produce a naturally derived, cell-free biological ingredient for skincare. And skincare is just the start.

Sign up to donate See the skincare
Juliette Humer, Muse Bio's founder, at a desk under a pink neon #MenstrualTech sign

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Why menstrual stem cells

Every cycle, the lining of the uterus rebuilds itself.

The endometrium is the only adult human tissue that renews itself every cycle. Menstrual blood carries the stem cells that do the work.

How it's made

One menstrual cycle, drawn schematically Lining thickness over about 28 days. It falls during menstruation, days 1 to 5, when stem cells are shed in menstrual blood, then rebuilds over the rest of the cycle. Menstruation Lining rebuilds Lining thickness Day 1 Day 7 Day 14 Day 21 Day 28 Menstrual blood carries stem cells from the lining Menstruation Lining rebuilds Lining thickness Day 1 Day 14 Day 28
One cycle, about 28 days. Not to scale.
Uterusthe lining renewsevery cycleMenstrual bloodcarries stem cellsfrom the liningStem cellsisolated and grownin the labSecretomewhat the cells release,with every cell removed

Donor program

Your period can do something useful every month.

We mail you a kit. You collect at home and ship it back prepaid. Donors are compensated for their time.

Sign up to donate How the program works
Donors talking together on a sofa in the Muse Bio office
Muse Bio secretome as supplied to brands: a bottle of conditioned media and a vial of lyophilised powder

The ingredient

Our ingredient, in our partners' skincare.

The secretome is a cosmetic ingredient. We supply it to partner brands, who make and sell their own products.

About the skincare

Cellora ONLY1 serum bottle
Cellora's ONLY1 Growth Factor serum: one example of what our partners make with Muse Bio's secretome.
I've started to look a little bit forward to my period every month because it's exciting to be able to contribute to research every month.
— Muse Bio donor
Juliette Humer, Muse Bio's founder, smiling in conversation

Research

The reason we started.

Menstrual stem cells are a promising source for regenerative medicine and longevity research. Muse Bio was started to bring that work out of the lab and to patients.

Read the research