According to Amazon, Nioxin vitamins are an oral supplement intended to help regrow hair and stop hair loss. The full name of the product is Nioxin Intensive Therapy Recharging Complex.
According to Mz Mahagony Chic, Nioxin vtamins were discontinued by the manufacturer in 2012. Nioxin is a division of Proctor & Gamble. There is no mention of Nioxin vitamins on Nioxin's website as of 2014.
The full list of ingredients in Nioxin vitamins is not available. Mz Mahagony Chic says Nioxin vitamins contained biotin and horsetail extract. Amazon says it contains antioxidants, marine concentrates, B vitamins and some other vitamins.