Is Biotin Safe with Doxycycline?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Long-term doxycycline use for acne may reduce gut bacteria that produce biotin endogenously. Consider biotin supplementation at 2.5mg/day after discussing with your provider. Take biotin at least 2 hours apart from doxycycline to avoid any absorption interference.
Why this interaction occurs
Doxycycline, as a broad-spectrum antibiotic, disrupts the gut microbiome including biotin-producing bacteria such as Bacteroides and Lactobacillus species. Prolonged use in acne treatment may lead to subclinical biotin deficiency manifesting as hair thinning or brittle nails.
Evidence
Evidence level: moderate.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 72,559 reports mentioning Doxycycline. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Doxycycline + supplement combination on this page.
FAERS reports are voluntary and cannot prove that a drug caused an event. Do not use report counts to assess the safety of this specific drug-supplement pair.
Frequently asked questions
Related interactions
All Biotin interactions → · All Doxycycline interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.