Active ingredient
PHA
INCI · Gluconolactone
PHA (polyhydroxy acid), most often Gluconolactone, is a large-molecule exfoliating acid that refines the surface gently. Its size keeps it on the upper layers, which makes it a tolerable option for sensitive or mature skin, and it also draws in moisture.
Mechanism in detail
What PHA does
Loosens surface cell bonds slowly while binding water, so it smooths the look of texture with minimal sting.
Where it helps
Concerns PHA addresses
Aging
The first time you notice it is rarely a wrinkle. It is a quality of light — the way your skin catches it differently in a morning mirror, or the photo where you look more tired than you feel. The mechanism is real (collagen synthesis slows; elastin fragments; barrier turnover lengthens), but the felt experience comes first. Serenity Age is the range BIOSAR built for that pivot — Retinol for visible renewal and collagen support, peptides selected for documented signaling activity, and the SPF discipline that protects every other active you apply.
Hyperpigmentation
Across Fitzpatrick III–V skin tones — the majority of darker skin tones — the most common consultation is the same: the patch on the cheekbone that did not fade. Melasma, post-inflammatory hyperpigmentation, the marks that follow acne and friction. The pattern is photoresponsive, the mechanism is mapped, and visible improvement is reachable with consistent care. The Whitepurity range is built for that work — Alpha-Arbutin for stable tyrosinase inhibition, Niacinamide-led brightening, and the SPF discipline that decides whether any of the rest will hold.
From the BIOSAR catalog
Products formulated with PHA
Serenity Age250 ml
Anti-Aging Toner
Salicylic Acid · Glycolic Acid · Licorice