Supplement stacks / Biotin + Levothyroxine
Can You Take Biotin with Levothyroxine?
Biotin supplementation may not significantly interfere with levothyroxine absorption, but caution is advised due to limited evidence on interactions. It is recommended to consult a healthcare provider before combining these substances.
Conservative, AI-assisted reading of publicly available medical sources (NIH, Mayo Clinic, WebMD, Examine.com). Informational only — it can't account for your medications, conditions, or genetics.
Generally considered safe at recommended dosages; high doses may lead to skin rashes or gastrointestinal upset.
Typical dosage: 30-100 mcg daily
- Skin rash
- Gastrointestinal upset
- Consult healthcare provider if taking thyroid medications; monitor thyroid function tests.
Safe when taken as prescribed; overdose can lead to hyperthyroidism symptoms.
Typical dosage: 25-300 mcg daily, individualized based on thyroid levels
- Weight loss
- Increased heart rate
- Nervousness
- Take on an empty stomach; avoid calcium and iron supplements within 4 hours.
These come up in questions about this combination — they are not part of the pair above.
Vitamin D3
Generally safe; excessive doses can lead to toxicity.
Typical dosage: 600-2000 IU daily, depending on individual needs
- Nausea
- Vomiting
- Weakness
- Monitor blood levels if taking high doses; consult healthcare provider.
Magnesium
Safe at recommended dosages; excessive intake can cause diarrhea.
Typical dosage: 310-420 mg daily, depending on age and sex
- Diarrhea
- Nausea
- May interfere with levothyroxine absorption; take at least 4 hours apart.
Zinc
Generally safe; high doses can cause nausea and immune dysfunction.
Typical dosage: 8-11 mg daily
- Nausea
- Diarrhea
- May interfere with levothyroxine absorption; take at least 4 hours apart.
Take levothyroxine in the morning on an empty stomach; biotin can be taken at any time but should be spaced from levothyroxine.
- Consult with a healthcare provider before starting biotin or any new supplement.
- Consider spacing biotin and levothyroxine doses to minimize potential interactions.
- Monitor thyroid function tests regularly if taking biotin.
- Take levothyroxine on an empty stomach and avoid taking it with biotin or other supplements that may interfere.
Can you take Biotin and Levothyroxine together?
Biotin supplementation may not significantly interfere with levothyroxine absorption, but caution is advised due to limited evidence on interactions. It is recommended to consult a healthcare provider before combining these substances.
How safe is the Biotin and Levothyroxine combination?
Our analysis of publicly available medical sources scores this combination 6/10 (medium risk). This is an informational estimate, not medical advice — always confirm with a healthcare professional.
When should you take Biotin and Levothyroxine?
Take levothyroxine in the morning on an empty stomach; biotin can be taken at any time but should be spaced from levothyroxine.
What should you watch out for when combining Biotin and Levothyroxine?
Monitor thyroid function tests regularly if taking biotin. Take levothyroxine on an empty stomach and avoid taking it with biotin or other supplements that may interfere.
Taking more than these two? Run your complete supplement list — plus any medications — through the live checker for a combined analysis.
Analyze my stackGenetics change how you process supplements like these. Upload raw 23andMe or Ancestry data for a personalized supplement report.
See the DNA reportNot medical advice
Analysis generated August 10, 2026 · Sources include NIH, Mayo Clinic, WebMD, and Examine.com · How our analysis works