maybe have a read up on the ojon products panda, you might find they will be ok for you, they are made from natural ingredients.
if you order from qvc (i think theyre the only people who sell it) and you find you dont like or get on with it, you can return it, even though youve used some, within their 30 day money back guarantee.
i buy the kelp tablets from holland and barratt, boots and supermarkets dont sell them.
Me and my mam swear by vitamin b complex for strengthening hair. Take it with evening primrose oil too. My mam suffered with alopecia and she swears by them two :)
An experienced stylist who knows how to put texture & body into your style will give an appearance of thicker hair. eg. shorter hair near scalp, cut into style with the longer hair, supports the length to appear thicker.
Or, increase the blood flow to the scalp by stinging it with nettles or using a massager.