Ok I have just read the website. The only thing that is proven to regrow hair in bald spots is minoxidil (Regaine). It only works while you continue to use it and doesn’t always work.
The stuff on the nutriol website uses vague language and makes no declarations that would be enforceable in law.
"Whether it is totally unexpected or genetically inevitable, noticing a change in the texture of your hair may seem like the beginning of the end. Instead of watching and worrying, would it not feel great to be truly proactive in protecting the future of your hair?
To help ensure a lifetime of healthy looking hair, Nutriol® Shampoo enhances the vitality of your hair and scalp with patented technology. Nutriol® Shampoo features Tricalgoxyl®, a clinically proven seaweed derivative developed by a European laboratory. Formulated to remineralise the scalp and hydrate the hair, Nutriol® helps you hair look and feel abundant. By helping revitalise the scalp for maximum hair vitality, Nutriol® gives you the hair care technology to fight back!”
is it worth buying? well if it makes you feel good to use it then maybe.....but as someone who is female, has thinning hair and has looked into the claims of many many shampoos and tried a few, I would say don’t bother.