Vitamin B7 is also known as biotin, and it helps your body metabolize carbohydrates and protein. Additionally, this vitamin is involved in hormone production, which can aid in weight loss. Specifically, increased levels of vitamin B7 are related to increased levels of insulin-like growth factor-1, or IGF-1, according to a study from the April 2009 issue of "European Journal of Nutrition." Research from the May 2011 issue of "Obesity" indicates that higher levels of this hormone correspond to lower BMI and body fat percentage.
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