Collagen gel hair and nails the original product of Natural Collagen Inventia's - Natural Collagen Graphite Natural Collagen Inventia Hair & Nails is a collagen gel recommended for hair and nail care, and as a bathing addition. The natural collagen gel is widely used in Europe in both hairdressing and beauty salons, and can also treat joints or nourish the skin. The collagen gel is a semi liquid gel in a pearl graphite shade. The gel form allows for easy application and spreading for use with hair and nails. We recommend Natural Collagen Inventia Body gel for body care, and Natural Collagen Inventia Face gel for facial and delicate body parts.