Numbuzin — No.5 Glutathione TXA Advanced Dark Spot Ampoule Concentrate

This serum is one of the few PRESS & MIX formats in the catalog — and this galenic choice is the most relevant formulation decision in the product description. Glutathione is an unstable molecule in aqueous solution: it oxidizes rapidly upon contact with water and light, losing most of its activity. Storage in anhydrous powder form until the moment of use is the only way to guarantee the full potency of glutathione at application. This is a real difference compared to glutathione serums in stable aqueous formulas (where the active concentration is often reduced or stabilized by chelation). The formulation of STEP 1 is consistent with the depigmenting objective. Sea buckthorn water (Hippophae Rhamnoides Water) replaces purified water as the base — rich in carotenoids, natural vitamin C, and antioxidant flavonoids. TXA in position 2 and glutathione in position 4 indicate significant concentrations. Niacinamide in position 5 complements by inhibiting melanosome transfer. Ascorbic acid (vitamin C) adds a fourth antioxidant/depigmenting pathway. Thioctic acid (ALA), CoQ10, cyanocobalamin (B12), and bisabolol reinforce the antioxidant and soothing action. Triple depigmenting mechanism profile: TXA (melanocyte-keratinocyte communication), glutathione (tyrosinase + pheomelanin orientation), niacinamide (melanosome transfer). This is a well-constructed synergy. A customer point never to omit: the sulfurous/alliaceous smell of high-purity glutathione is intrinsic and unavoidable. The manufacturer clearly states this on their website. Without this information beforehand, a large proportion of customers will believe they have received a spoiled product and will request a refund. This mention is mandatory in the Shopify product description.