Clinical decision-support only. For use by licensed dental professionals. Not a substitute for professional judgment or a complete drug reference. Always verify with primary sources.
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Vitamin

Vitamin B7 (Biotin)

Likelihood in at-risk patientsLow

Likelihood of deficiency within an at-risk group, not the general population.

Evidence confidenceLow

Strength of the peer-reviewed evidence.

Food sources

Eggs, Nuts, Whole grains, Legumes

Typical intake: 30 mcg/day for most adults (AI).

Upper limit: No UL established. Note: high-dose biotin supplementation is a well-documented cause of falsely abnormal lab results (e.g. thyroid panels, troponin), worth asking about before ordering or interpreting bloodwork.

Dental & oral effects of deficiency

No well-established oral-specific sign of deficiency on file.

Associated with deficiency

  • Biotin deficiency (rare): Dermatitis, hair thinning, conjunctivitis, and neuropathy; can occur with prolonged raw egg-white consumption or certain anticonvulsants.

Dental & oral effects of surplus / excess

No well-established oral-specific effect of excess intake on file.

Sources

  1. Biotin: Health Professional Fact Sheet. National Institutes of Health, Office of Dietary Supplements. NIH Office of Dietary Supplements, 2026.
  2. A Prescription for Change: Food as Medicine & the Vital Role of Nutrition in Patient Care. teethFirst. Continuing education course material, 2025.