2/3 cup Dr. Bronner’s liquid castille soap. 2/3 cup Dr. Bronner’s liquid castille soap. Anti-Dandruff Shampoo… 10 drops Geranium (eo) BPA free plastic or glass dispenser bottle . 1/2 cup coconut milk. That said, there are many, many more chemical substances in existence that are extremely dangerous but did not quite make the top 10. Anti-Dandruff Shampoo… 10 drops Geranium (eo) BPA free plastic or glass dispenser bottle. 15 drops of essential oil of your choice (see below) 2 teaspoons of olive oil . Many chemists simply refuse to work with one or more of them because of the immense risk they pose to human health. The 10 chemicals above are certainly some of the most toxic, dangerous and harmful around. 1 Sodium Lauryl Sulfate (SLS) and Sodium Laureth Sulfate (SLES) SLS and SLES are surfactants often found in cleaning products. They are typically used as foaming agents in shampoos… While there are many bad ingredients in shampoos and harmful shampoo brands, plenty of shampoos use only natural, non-toxic, and organic ingredients, and you can even make your own homemade hair … Hydrating Shampoo. Hydrating Shampoo. Top 10 Toxic Ingredients to Avoid in Shampoos and/or Conditioners. 15 drops of essential oil of your choice (see below) 2 teaspoons of olive oil. The Center for Environmental Health (CEH) revealed independent testing on Tuesday finding a cancer-causing chemical in 98 shampoos, soaps and other personal care products sold by … 1/2 cup coconut milk.