Young & Garvey, of Newark, New Jersey, registered this brand name as a trademark in 1901. They claimed to have been selling the product since 1900. The trademark petition was sent in by Frank Young. Since the label on the trademark petition was small, I've transcribed some of the text.
O.K. HAIR TONIC
For the preservation, beauty, growth and restoration of the hair. Keeps the head cool, allays the itching and fever of the scalp, gives a rich gloss to the hair and will free the head from all dandruff immediately. A perfect cure for dandruff, highly perfumed, and free from oil. Directions for using. ...
