Oxford Biolabs is a U.K.-based company selling a range of all-natural products for hair loss sufferers. The company differentiate its brand with the inclusion of l-carnitine-l-tartrate (as Carnipure®) in their supplements and topicals, which they claim helps support hair growth in men and women with hair loss.
For more information on Oxford Biolabs and an in-depth look at l-carnitine, see this resource: