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Description
According to Susan B

Annals of Clinical and Laboratory Science, 45(4), 426432

The recommended daily intake of biotin is 30100 mcg, though higher doses (up to 10,000 mcg) are commonly used in hair growth supplements with no reported toxicity
The FDA has not reviewed or approved compounded products for any use for safety, efficacy, or quality

Another test called TSAT, or transferrin saturation, shows how much iron is available to make red blood cells
