WebMD - Guava is packed with vitamin C, which helps protect your hair from breaking -- just 1 cup has 377 milligrams! Other foods that can help keep your hair healthy: https://wb.md/2QOAgXO
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ILiveActive - Biotin is an important component of enzymes in the body that break down substances like fats and carbohydrates. There isn't a good laboratory test for detecting low biotin levels, so
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