Why does the adjustment period take so long?

Twenty-seven days is the average life cycle of a skin cell - and not coincidentally, it's close to the adjustment period most customers report. Your scalp's sebaceous glands were conditioned to operate at elevated output because conventional shampoo kept removing sebum faster than normal physiology required. Reversing that conditioning takes one full cycle of cellular turnover. This is why dermatologists tell patients to give skincare changes at least four weeks before evaluating. Most customers find the experience is shorter than 27 days, and many report no meaningful adjustment at all. If you're in the window and hair isn't where you want it yet, the biology says you're probably close.