just want to keep my hair strong and healthy. With hair care routine, I am quite certain one needs to adopt a wholistic approach. Hair serums like this may actually work to some extent, but at my age I am lucky to have any hair at all... haha. I tend to use more than the recommended dosage without any noticeable side effects, I noticed my nails also got stronger and grow faster from massaging this product into my scalp. I would like to try some products from other vendors, but I won't know which product I benefiting from if I try them all together. I like the ingredients in all of Hairmaraki's products. thank you.