Why does 5% Minoxidil make my hair look thicker 30-40 min after applying it?

Topical minoxidil is used to also thicken hair in addition to promoting hair regrowth. I suggest seeing a hair loss expert to evaluate and go over your condition and provide you information about your best options. There are great non-invasive options like prp/progesterone which work well with Minoxidil. See an expert. Best, Dr. Emer

Minoxidil does not contain any substance for hair thickening  as a make up, such as keratine fibres or kelly wool substance etc .That thickening effect happens  probably due to remnants of serum that fixed on hair shaft .

Thank you for the post and question. The reason why your hair looks and feels thicker after Minoxidil application is because of the residue it leaves behind once applied on to the hair. Similar to how the minoxidil foam can create as well.