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Aveda has a new shampoo and conditioner system that will supposedly thicken your hair. And it isn`t one of those that just plumps your hair to make it LOOK thicker - it is actually supposed to make a difference in the long run. What they have is a wintergreen-derived salicylic acid that will renew your scalp. It will keep pores from being clogged because clogged pores on your head can affect the way the hair grows. It has ingredients like millet seed and milk thistle to equalize the lipid balance on your head and also has some other herbs that are supposed to make the hair thicker. It sounds like this is a great product because it works with the existing hair on your head and then also target those hair follicles to help the newer hairs grow in thicker. There is a conditioner to go with this. They are each $24 (eek!), but I think for anyone dealing with thinning hair, it would be worth the investment.
Image Source: http://www.aveda.com/product/8419/21056/Collections/InvatiTM/invati-exfoliating-shampoo/index.tmpl