Shapley’s Original M-T-G plus is the same formula as the Original M-T-G, now with a new herbal scent. It can treat a range of skin conditions, including rain rot, scratches, tail rubbing, girth itch and bacterial issues. It has also been proven to increase mane growth by as much as 3 inches a month. Rub a small amount into the affected area, there is no need to rinse or wash between applications. For hair growth rub a small amount once a week into the base of the mane or tail.