I like using the tonic because the absorption to the scalp nourishes my hair follicles. I've been using the product for several long weeks, and I have noticed hair growth to thin front edges from wearing hair pieces, hats and head bands. Also the back section of my head my hair broke out due to an autoimmune problem. I love how this product goes on to my scalp and tingles after a good head massage in brushing the scalp with a stimulator brush.The only problem, I had being that I have thick hair. I had to use a dropper to apply the tonic to my scalp as the bottle applicator did not work for me.Nevertheless this is a great hair repair product but I think it's a product that you will have to keep using for great results. Especially if you have thinning hair due to DHT are autoimmune problems are any health problem depleting your scalp of nutrients. My hair stopped shedding from the roots and is once again growing & thicking back up.My only concern about this product is that the price is expensive if you have to order it bi-monthly along with other products in the same brand name. I plan on changing over to this brand of hair products for more improved hair results.Thank you