I purchased this scalp serum and followed the application instructions exactly as written at the back of the bottle. However, the next day, my scalp started burning. When I showered, the pain was intense, and I noticed small, pimple-like bumps all over my scalp. I ended up spending far more money on a dermatologist than I did on the serum itself. I was diagnosed with folliculitis, and when I showed the serum to my dermatologist, they found it contained a high concentration of Staphylococcus aureus and the possibility of clogging pores, which could cause to inflammation and infection. Since using it, my scalp has become red, tender, and flaky, and my hair loss has noticeably worsened. The pain has been severe. Please think twice before using this product.