Women’s products are designed to make every hair on your head the same color whether it is gray or not, which results in a less natural look. They also come in a variety of fashion colors, which are not appropriate for men who don’t want obvious color changes. Further, Grecian 5 only takes 5 minutes versus 30 to 45 minutes. And it doesn’t contain harsh ammonia, unlike most women’s color brands. Bottom line: Grecian 5 was developed by men for men to match men’s specific needs.