Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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Here you will find more than 6 years of questions and my answers. It is searchable and offers a great deal of information.
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All the best,
Dr. Getty
Hello Liz,
Barley grass is a cereal grass and its powdered form is a nutritious food. However, I have not come across anything that states that it is particularly high in biotin, other than it contains biotin, along with several other B vitamins.
If you're after more biotin in the diet, say for hoof growth, you need to add at least 20 mg of this vitamin per day. Barley grass will not do this, as will no food. Supplementation is the only way to obtain this level. If you are already feeding a vitamin/mineral supplement, you can safetly add BioFlax 20 to the diet for the additional nutrients for added hoof health.
All the best,
Dr. Getty 
Where are you from? Bayfield, CO