Just For Men Shampoo-In Hair Color targets only gray for a natural look. It replaces gray with subtle tones that match your own natural hair color. The ammonia-free formula works in 5 easy minutes. It is vitamin-enriched and rejuvenates hair, leaving it thicker and fuller-looking. The ammonia-free formula won't damage hair and lasts up to six weeks. Just For Men comes in 11 natural-looking shades, so it's easy to find one that truly matches your natural hair color. Can't decide between two sh