IGK Hair First Class Detoxifying Charcoal Shampoo New to IGK Hair's best-selling First Class line is the IGK Hair First Class Detoxifying Charcoal Shampoo ($27) and conditioner. The duo is powered by activated charcoal to detox your hair and scalp for a deep clean. Image Source: sephora.com IGK Hair First Class Detoxifying Charcoal Shampoo $27 from sephora.com Buy Now