Guest post by beardoholic.com You might be surprised by the active ingredients in a typical bottle of shampoo. Without digging too deep, you have polyethylene glycol, diethanolamine, triethanolamine, propylene glycol, parabens, petroleum, and mineral oils. To break this down into terms you might better understand, those include allergens, carcinogenic chemicals, anti-freeze, harsh detergents, toxic substances, poisonous fragrances, and a few scalp irritants. These are the things we use on a ...