Biotin is safe to take — even at high doses. But taking too much can sometimes cause side effects like stomach ache, trouble sleeping, and excessive thirst. Talk to your healthcare provider if you think you've taken too much biotin. You can also contact Poison Control if you're having trouble reaching your provider.
Mayo Clinic states that 10,000 mcg is a safe dose, as no adverse side effects have been noted to date. Reassuringly, even “mega doses” of 300,000 mcg found no side effects in neurological research.
Excess in the body is rare, and since biotin is a water-soluble vitamin, it is excreted in the urine when in excess. Signs and symptoms of biotin overdose may include and are not limited to insomnia, excessive thirst, and urination.
Regular intake of excessive quantities of certain nutrients can cause hair loss in some cases due to a temporary condition known as Telogen Effluvium. However, the effects of too much vitamin B7 - also known as biotin toxicity - remain unconfirmed.
While 5,000 mcg of biotin may work well for some people, for the most part, that may be too high for others who find that 200 mcg of biotin helps their hair grow. Look for a biotin vitamin that doesn't contain a ridiculously high dose amount like 10,000 mcg – this is usually excessive.
The bottom line. There's no strong evidence to support using biotin for hair growth or to prevent hair loss in people without a deficiency. Because hair thinning and poor hair growth are sometimes associated with a biotin deficiency, correcting a deficiency can help restore hair growth in some people.
No, there is no evidence to suggest taking biotin supplements can lead to weight gain. In fact, biotin is sometimes touted as a weight-loss supplement.
While biotin is added to some shampoos that claim to reduce hair loss, there is no evidence that this works. Consuming foods rich in healthy vitamins and minerals will help with overall hair health. The best natural sources of biotin are meat, eggs, fish, seeds, nuts, and vegetables.
Biotin is found in many foods and beverages, including milk, carrots, salmon, and nuts. It can also be taken as a supplement if needed. The recommended daily amount is 30 micrograms. However, taking biotin supplements is not recommended unless suggested by your doctor.
If you have a condition that's associated with biotin status, such as alopecia or intestinal malabsorption of biotin due to a variety of factors, supplementing with the nutrient may improve hair and beard growth, though it has limited effectiveness in healthy men ( 9 ).
Adults and teenagers—30 to 100 micrograms (mcg) per day. Children 7 to 10 years of age—30 mcg per day. Children 4 to 6 years of age—25 mcg per day. Children birth to 3 years of age—10 to 20 mcg per day.
No evidence in humans has shown a toxicity of biotin even with high intakes. Because it is water-soluble, any excess amount will leave through the urine. There is no established upper limit or toxic level for biotin.
How fast does biotin work for hair growth? Research pertaining to how quickly vitamins work in the body is limited, however, we have found that some begin to see and experience benefits approximately 30 days after you start taking biotin. It may take up to 90 days or longer for some individuals.
(1) The half-life of biotin within the body is about 2 hours, but may be longer in individuals with long term regular biotin intake. (2) Some studies document assay interference persisting for 24 hours following high dose biotin ingestion, with effects possibly lasting longer in pediatric patients.
Biotin is a common component of multivitamin preparations and at high doses it has been reported to cause interference in immunoassays resulting in abnormal thyroid function tests .
So which supports hair growth more: collagen or biotin? Based on scientific studies, it seems that collagen has a better claim to improving the condition of your hair. However, both can actually be used together for well-rounded nutrition and countless health benefits, aside from promoting hair regrowth.
Sources of Biotin
Foods that contain the most biotin include organ meats, eggs, fish, meat, seeds, nuts, and certain vegetables (such as sweet potatoes) [2,12].
Answer: No Vitamins are better or worse for hair growth.
There are no vitamins that target hair growth.
Most commonly, biotin use can result in falsely high levels of T4 and T3 and falsely low levels of TSH, leading to either a wrong diagnosis of hyperthyroidism or that the thyroid hormone dose is too high.
Along with boosting metabolism, biotin can also aid in weight loss. Essentially, consuming or ingesting biotin elevates your resting rate of metabolism. As this vitamin increases your metabolism, it can help accelerate weight loss, especially when paired with chromium.
Improved Skin and Fingernails
Research also shows that biotin helps improve skin's hydration, smoothness, and appearance. In addition, some studies show that biotin can strengthen fingernails and make them grow faster. Biotin is a versatile addition to your beauty routine.
Eggs are full of B vitamins, protein, iron, and phosphorus. The yolk is an especially rich source of biotin ( 5 ). A whole, cooked egg (50 grams) provides approximately 10 mcg of biotin, or approximately 33% of the DV ( 4 ).
After starting a biotin supplement routine, you can expect to start seeing a difference in about three to four months. Results may vary depending on the amount and type of biotin you're taking. You can find biotin at most drug stores and in any vitamin shop.