2014 follow-up study was retracted in 2025, which means the foundational evidence base has significant integrity concerns that should be weighed carefully
Clinical studies demonstrate increased hair thickness, density, and reduced hair loss in both men and women
Plotnikov, D
Choose Vitamin C If You: Have sun damage, age spots, or general dullness from UV exposure Want antioxidant protection alongside your brightening treatment Have oily or normal skin that tolerates actives well Are comfortable with a product that requires careful storage and regular replacement Choose Alpha Arbutin If You: Have post-acne marks or PIH from breakouts Have sensitive, reactive, or dry skin Have a deeper skin tone and want to minimise irritation risk Want a low-maintenance, stable brightener that works day and night Use Both If You: Want to address multiple types of hyperpigmentation simultaneously Have combination skin that can handle layered actives Are looking for the most comprehensive brightening routine possible Pro Tip: Always patch test both ingredients separately before combining them, particularly if your skin is reactive
Formulation pH is critical: GHK-Cu is most stable at pH 5.06.0
When symptoms are attributed to high B12 intake, they typically include: Skin reactions : Acne-like eruptions or rosacea-type rashes, particularly with hydroxocobalamin injections (listed as rare adverse effects in the product information) Gastrointestinal disturbances : Mild nausea, diarrhoea, or abdominal discomfort Headaches : Occasional reports of headache following B12 injections Anxiety or restlessness : Anecdotal reports, though causation remains unestablished It is crucial to distinguish between symptoms caused by elevated B12 levels and those arising from the underlying conditions that elevate B12
