Best supplements for thickening hair please?

I hate to say it, but I don’t know that there are any supplements that really stand up to medical scrutiny, but the ones that are most popular among hairdressers and friends with hair issues include Viviscal Pro and Philip Kingsley’s Density supplements. Lots of people (me included) think collagen supplements help with hair strength as well as with skin/ nails/ joints. Hormone supplementation may help too if this is something that’s appropriate for you. You also want to think about massaging the scalp to enhance blood circulation, and using a scalp scrub occasionally so the follicles don’t become blocked, and healthy lifestyle – a good diet, (lots of protein, lots of colourful vegetables), plenty of sleep, reduced stress, etc. – makes a big difference to hair because when we’re stressed, our body prioritises its main functions and organs and hair suffers from a reduced supply of nutrients.