Extra Strength Biotin 10 mg (10,000 mcg) [Discontinued] by NOW

LIKELY EFFECTIVE

• Biotin deficiency. Oral and injectable biotin prevents and treats biotin deficiency. Details: Biotin up to 10 mg daily has been used to treat and prevent biotin deficiency. Injections of biotin 150 mcg daily for 3-5 days have been used in adults. Biotin deficiency might occur due to different etiologies such as inherited biotinidase deficiency, malnutrition, chronic use of anticonvulsants, pregnancy, and excessive and chronic raw egg consumption (6243,19347). A very small study in newborns aged 1-6 months shows that adding biotin to infant formula safely improves biotin status in formula-fed infants (111365). The validity of these findings is limited by a lack of blinding, no randomization, and the small sample size.

POSSIBLY INEFFECTIVE

• Multiple sclerosis (MS). In spite of contrary reports, high-dose biotin (300 mg daily) does not reduce disability in patients with progressive MS. It also does not seem to be linked to an increased risk for relapse. Details: Although most earlier research suggested benefit, the highest quality evidence shows that high-dose biotin does not improve outcomes in progressive MS (95662,102963,102966,104011). A large multi-centered randomized clinical trial (SPI2) in patients with progressive MS and high disability shows that taking biotin 100 mg three times daily for 15 months does not improve disability, as measured on the expanded disability status scale (EDSS), or 25-foot walking time, when compared with placebo. The SPI2 clinical trial also did not find that biotin increases the rate of relapse (104011), a concern raised in one observational study of high-dose biotin (104000). Also, a large observational study of adults with progressive MS failed to identity an increase in annualized relapse rates in patients that reported taking biotin when compared with controls (105716). Other observational research has also found no effect on the relapse risk (102963,102964). There is some speculation that any increased rate of relapse identified in some high-dose biotin cohorts might be due to detection bias or reduced compliance with disease-modifying therapies.
• Seborrheic dermatitis. Oral biotin doesn't seem to improve seborrheic dermatitis of infancy. Details: A clinical trial in infants with seborrheic dermatitis shows that biotin given by mouth does not improve symptoms when compared with placebo (8469).

INSUFFICIENT RELIABLE EVIDENCE to RATE

• Alopecia areata. It is unclear if oral biotin is beneficial for alopecia areata. Details: A small clinical study in healthy adults with alopecia areata shows that weekly injections of intramuscular biotin 5 mg/1 mL and dexpanthenol 250 mg/2 mL for 6 weeks reduces hair fall count and transiently increases hair density compared with baseline (111366). The validity of these findings is limited by a lack of a placebo control group, small sample size, and short duration of treatment. It is unclear if the effects are due to biotin, dexpanthenol, or the combination. Another small clinical study in 9-year-old children with alopecia areata shows that taking biotin 20 mg with zinc aspartate 100 mg orally along with topical application of clobetasol propionate 0.025% daily for one year promotes hair regrowth in 33% of children, compared with 0% in the group receiving the steroid deflazacort (6932). It is unclear if these effects are due to biotin, zinc, topical clobetasol, or the combination.
• Amyotrophic lateral sclerosis (ALS, Lou Gehrig's disease). Although there is interest in using oral biotin for ALS, there is insufficient reliable information about the clinical effects of biotin for this condition.
• Biotin-thiamine-responsive basal ganglia disease. Adding oral biotin to oral thiamine does not seem to improve most symptoms associated with this condition, although it may slightly speed recovery from acute crisis in children. Details: A small case series in children ages 1-12 years with biotin-thiamine-responsive basal ganglia disease has found that adding biotin 5 mg/kg daily to thiamine 40 mg/kg daily for 30 months is not associated with additional symptomatic improvement in encephalopathy, seizures, dystonia, or other neurologic sequelae when compared with taking only thiamine. However, taking biotin with thiamine is associated with a 1-day reduction in recovery from acute crisis when compared with thiamine alone (95661).
• Brittle nails. Low quality clinical studies suggest that oral biotin might improve nail thickness and prevent the splitting of brittle nails. Details: Some small, low quality clinical studies in people with brittle nails shows that taking biotin 2.5 mg orally daily for 1.5 to 15 months increases nail thickness and decreases the splitting of fingernails and toenails in some people when compared with baseline (171,35593). The validity of these findings is limited by the small study sizes and the lack of a comparator group.
• Depression. Although there is interest in using oral biotin for mild depression, there is insufficient reliable information about the clinical effects of biotin for this condition.
• Diabetes. It is unclear if oral biotin is beneficial for type 2 diabetes. Details: A meta-analysis of randomized controlled trials shows that taking biotin 1.5-15 mg orally daily for 1-3 months does not improve fasting blood glucose or serum insulin levels when compared with placebo. However, the validity of these results is limited by inclusion of subjects with and without diabetes (110044). A very small study in adults with type 2 diabetes also shows that taking biotin 5 mg three times daily for 28 days does not affect glucose or insulin levels when compared to baseline (11579). Biotin has also been studied in combination with other ingredients. Preliminary clinical research shows that a taking a specific supplement containing a combination of biotin 2 mg and chromium picolinate 600 mcg (Diachrome, Nutrition 21) can lower blood glucose and glycated hemoglobin levels in patients with type 2 diabetes who are poorly controlled on oral hypoglycemic drugs (12385,12390,15169). It is unclear if these effects are due to biotin, chromium, or the combination.
• Diabetic neuropathy. Although there is interest in using oral and intramuscular biotin for diabetic neuropathy, there is insufficient reliable information about the clinical effects of biotin for this condition.
• Muscle cramps. It is unclear if biotin is beneficial for improving muscle cramps in patients undergoing hemodialysis. Details: Patients undergoing hemodialysis are prone to muscle cramps. A small clinical study in patients with hemodialysis-related muscle cramps shows that taking biotin 1 mg in the morning daily for at least one week prevents and reduces severity of muscle cramps when compared to baseline. Cessation of biotin led to recurrence of cramps, and restarting oral biotin led to resolution of cramps during hemodialysis (89475). The validity of these findings is limited by the lack of comparator group. More evidence is needed to rate biotin for these uses.

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LIKELY SAFE ...when used orally and appropriately. Biotin has been safely used in doses up to 300 mg daily for up to 6 months. A tolerable upper intake level (UL) has not been established (1900,6243,95662,102965). ...when applied topically as cosmetic products at concentrations of 0.0001% to 0.6% biotin (19344).

POSSIBLY SAFE ...when used intramuscularly and appropriately (8468,111366).

CHILDREN: LIKELY SAFE
when used orally and appropriately. Biotin has been safely used at adequate intake doses of 5-25 mcg daily for up to 6 months (173,6243,19347,19348,111365). A tolerable upper intake level (UL) has not been established.

PREGNANCY AND LACTATION: LIKELY SAFE
when used orally and appropriately. Biotin has been safely used at the adequate intake (AI) dose of 30 mcg daily during pregnancy and 35 mcg daily during lactation. It has also been used in supplemental doses of up to 300 mcg daily (6243,7878). A tolerable upper intake level (UL) has not been established.

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General ...Orally and topically, biotin is generally well tolerated.
Most Common Adverse Effects: None.

Gastrointestinal ...Orally, high-dose biotin has been rarely associated with mild diarrhea. Transient mild diarrhea was reported by 2 patients taking biotin 300 mg daily (95662).

Pulmonary/Respiratory ...In one case report in France, a 76-year-old female frequent traveler developed eosinophilic pleuropericarditis after taking biotin 10 mg and pantothenic acid 300 mg daily for 2 months. She had also been taking trimetazidine for 6 years (3914). Whether eosinophilia in this case was related to biotin, pantothenic acid, other substances, or patient-specific conditions is unknown. There have been no other similar reports.

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