15% Minoxidil HOSOKU (Formulated in Japan) Embrace Fuller-Looking Hair with Hosoku Minoxidil Formulas Hosoku Minoxidil Oil-Based 15%: Nourishing Care for Your Scalp Delicately blended for those who appreciate a deep-conditioning scalp treatment, our Oil-Based Minoxidil 15% is your ally in the pursuit of a fuller appearance for your hair.