ahk-cu topical peptide Cu and 2400mg of GHK Copper Peptide Hair Growth Serum
Description
Both cyanocobalamin and other forms of cobalamin can trigger these reactions, and the risk appears higher with parenteral (injection) administration compared to oral supplementation Khatrawi2022Sajan2023Ullah2018+1 MORE

So the benefit is real, but it is indirect and it depends on whether you were low to begin with

Aziz Pirani and Dr

If you experience fatigue, weakness, memory problems, or have a diet low in B12 (e.g., vegetarian or vegan diets), you might need a supplement
