Because this product is for babies, it will take twice the recommended squeeze amount (2 quarter size) for a full head of hair on an adult's scalp (circumfrance 30+ cm). Fortunately, it did not cause problems for my scalp, so the price for 2 bottles is reasonable and offsets the amount I pay for facial cleanser from a different line to manage problematic skin. I only gave this product 4 stars because I could not find such a product for an adult with the same formulation (ingredients).