Dr. Barbara Sturm

Dr. Barbara Sturm Niacinamide vs Numbuzin No.5: Glutathione Encapsulation Audit (2026)

Both use 5% niacinamide + liposomal glutathione. The $119 price gap is explained entirely by packaging and brand positioning — not formulation. The encapsulation smell test tells the difference between active and degraded glutathione.