Probiotics Explained
Postbiotics · Ferments · Bifida · Galactomyces · Pitera
Fermented and probiotic-derived ingredients support the skin barrier and calm reactivity; some types have small clinical trials behind them.
Label names (INCI): Bifida Ferment Lysate, Galactomyces Ferment Filtrate, Lactobacillus Ferment, Lactobacillus/Soybean Ferment Extract, Saccharomyces Ferment Filtrate, Bacillus Ferment
Written by the Oliareen editorial teamDermatologist review: pendingHow we write
What it does
Fragments and metabolites of friendly microbes that strengthen the barrier, calm reactive skin and switch on antioxidant and moisturising genes.
Often discussed for
This doesn't mean everyone with these needs it.
Concerns
How to approach it
If you're new to it
Start one new product at a time and patch test first: a little on the side of the jaw for a few days. Keep the rest of the routine simple.
General education, not a diagnosis or treatment plan.
Works well with
Examples of common pairings, not guaranteed combinations.
Use carefully with
Stacking several actives raises the risk of irritation. If you're on any prescribed medicine, ask your doctor before adding an active.
- May worsen Malassezia (fungal acne) or seborrhoeic dermatitis in some
- Safe in pregnancy
Possible reactions
Stop if burning doesn't settle, or if you get a red rash, itching, swelling or peeling. Swelling of the face, lips or eyes, or trouble breathing, needs urgent medical care.
When to see a doctorEvidence and timing
- Evidence
- Evidence: moderate
- Time to see a change (weeks)
- 2-8
Evidence comes from studies of specific formulas and strengths. Your product may behave differently.
Read next
Sources
- Gueniche A et al. Exp Dermatol 2010;19:e1-8 (B. longum lysate, reactive skin, randomised)
- Gueniche A et al. Br J Dermatol 2008 (Vitreoscilla 5% cream, 75 AD pts, double-blind)
- Galactomyces review J Clin Med 2022
- Galactomyces AhR, Clin Exp Dermatol 2015