Serenvit
GUIDE
BIOSAR uses vitamin C across three product families: a single-active complex serum, a brightening cream, and a multi-active brightening serum that combines vitamin C with alpha arbutin, tranexamic acid, and niacinamide. The picks below help you decide which formula fits your concern, skin type, and tolerance.
Vitamin C — typically as L-ascorbic acid or one of its more stable derivatives — works on three layers of skin: it shields against oxidative stress, fades post-blemish marks and pigmentation, and supports collagen scaffolding. Different formulations are tuned for different goals. The breakdown below sorts each BIOSAR vitamin C product by intended use case so you do not need to layer multiples in the same routine.
If your concern is uneven tone and lacklustre finish rather than full pigmentation, the Serenvit vitamin complex serum is the lightest formulation. Apply morning, under SPF.
When dark patches are persistent — sun lentigines, post-acne marks, melasma — vitamin C alone is rarely enough. The Whitepurity serum stacks alpha arbutin, vitamin C, niacinamide, and tranexamic acid in one formula, which both raises efficacy and keeps the application count down.
Yes. Daily morning application under SPF is the standard pattern. If your skin reacts mildly in the first week, reduce to alternate mornings until tolerance builds.
Refrigeration extends shelf life for unstable formulations. The BIOSAR vitamin C serums use a stabilizing buffer system, so refrigeration is helpful but not required. Replace any serum that has turned dark amber.
Both, layered. Vitamin C reduces oxidative pigment formation; alpha arbutin inhibits the pigment-producing enzyme directly. The Whitepurity serum combines them, which is why it outperforms either active alone.
Yes. The classic concern about flushing only applies to specific high-percentage formulations. The BIOSAR serums use a stabilized form that pairs cleanly with niacinamide; the Whitepurity serum already combines them.
If your routine already includes a different evening serum (retinol, peptides, AHA-BHA), the Whitepurity SPF 30 cream lets you keep vitamin C in the morning without adding a separate serum step.
Underarm hyperpigmentation responds well to topical vitamin C plus alpha arbutin. The Whitepurity roll-on family targets that specific zone, with a fragrance-free version for sensitive underarms.
