From 4-Legger® - Makers of 4-Legger USDA Certified Organic Dog Shampoo

Ingredient Name
Natural or Synthetic?
How Safe Is It?
Can It Be Organic?
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Henna Herb Powder (colorless)
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While best known as a human hair dye, Henna, extracted from the Henna tree (Lawsonia inermis)adds shine and definition to your dog's coat while deeply conditioning the hair follicle leaving your dog's coat smooth, silky, and shiny! Our neutral colored non dying Henna is also thought to have antibacterial, antiviral and inflammatory effects.
Hemp Seed Oil
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A powerful antioxidant and anti-inflammatory that works to improve your dog's skin.
Hexyl Cinnamal
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A naturally occuring scent ingredient that is synthetically produced in large scale. It has links to allergies and immune system toxicity.
Hydantoin
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Used as a preservative that slowly releases small amounts of antimicrobial formaldehyde over time. Many dogs have or can develop formaldehyde allergies/sensitivities. It also may cause skin or eye irritation. Formaldehyde is linked to cancer.
Hydrolyzed Silk
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Chemically altered proteins from silk, obtained from boiling silkworms. While it is considered safe and non-toxic, it is certainly not an ethical ingredient to source and should not be used.

Hydroxyethylcellulose

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A plant-derived thickening agent typically used as a binding agent or emulsifier. It is considered safe and non-toxic.

Hydroxycitronellal

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A known immune system toxicant with links to allergies. 

Hypochlorous acid
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Has strong links to allergies and immunotoxicity and contamination concerns from sodium hypochlorite (which also has strong links to allergies and immunotoxicity). 

Moderate concerns for non-reproductive organ system toxicity.