I’ve tried various serums to help grow back post chemo hair loss (lost hair 3 times) and this is by far the best for dense, good condition locks and no irritation 

I've been using this product for a while now and it has definitely made a difference to the way my hair feels and behaves. I have very fine, colour treated hair and was noticing it was thinning. I use the product every morning and can say it makes my hair feel a bit denser and consequently it looks fuller. It does seem to protect new growth and helps prevent breakage. Realistically, I won't ever have thick hair but this product helps make the best of what I have. It is quite expensive but I feel it's worth keeping it up.