, pure grade biotin made in the uk, the grade used in clinical nutrition products, many times stronger than the level found in multis, biotin for the normal function of the immune system & energy releasethis is an interesting member of the b vitamin family because whilst our body can’t make it (which is part of the definition of being a vitamin) the bacteria in our digestive system can make it & we can absorb it from this source. however antibiotics & intestinal disturbances can disrupt its normal production.biotin contributes to the process that releases energy from food & in the maintenance of normal skin & mucous membranes. it also contributes to the normal function of the immune system & the maintenance of normal hair.this is a high strength supplement & as such it really doesn’t need to be taken for much longer than a few months after which one of our multis or a b complex will provide adequate levels.