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There is evidence that supports the notion that taking recommended oral dosages of biotin has a positive effect on hair growth. Experts note that a deficiency in biotin leads to hair loss. However, biotin deficiencies are considered to be a rare occurrence.


There is no best dosage for biotin, as any commercially available biotin pill meets or exceeds daily recommendations. The daily recommended intake for adolescents and adults is 30 to 100 micrograms, according to Mayo Clinic.


The recommended daily dosage of biotin for adults is 30 to 100 micrograms, according to the Mayo Clinic. Infants to 3-year-old children should ingest 10 to 20 micrograms, 4- to 6-year-old children should take 25 micrograms, and 7- to 10-year-old children should receive 30 micrograms.


The recommended daily dosage of biotin is 30 to 100 micrograms for adults and adolescents, states Mayo Clinic. For children, dosage depends upon age. Children who are 7-10 years old take 30 micrograms, 4-6 year olds take 25 micrograms, and newborn up to age 3 take 10 to 20 micrograms.


Biotin is a popular vitamin that supports healthy hair growth, as it contains sulphur and other components needed to create more collagen. Collagen is responsible for skin protection, along with nail and hair health. High collagen levels keep hair shiny and prevent fragile, split ends.


There is no scientific evidence that biotin helps hair grow, states WebMD. Such claims are unsupported or untested. Biotin supports metabolism and promotes health in the skin, nerves, digestive tract and cells.


According to WebMD, any claims of biotin working to grow hair are not scientifically supported. Some other uses of biotin that have not been either supported or tested include treating cradle cap, hepatitis and depression.


As of 2015, there is insufficient evidence to show that taking biotin or vitamin H orally prevents or reduces hair loss. However, there is strong evidence to show that a biotin deficiency causes hair thinning, hair color loss, hallucinations, depression, and rashes on the eyes, nose and mouth.


Currently, there is not enough evidence to confirm that biotin helps promote hair growth. Claims that it helps hair grow faster are incorrect, according to Everyday Health. Studies do indicate, however, that taking biotin supplements improve the strength of hair.


Biotin supplements are likely effective for treating thinning hair when it is a symptom of biotin deficiency, states the National Institutes of Health's MedlinePlus. There is no adequate evidence as of 2015 to substantiate the claim that biotin is useful for hair loss when it is taken by mouth toget