Supplement Interactions
Check supplement and medication interactions backed by molecular evidence.
Data sourced from CTD, ChEMBL, PubMed. How we verify this data →
Sources verified as of April 2026
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Calcium and Vitamin D3: Can You Take Them Together?
Calcium and vitamin D3 have a synergistic relationship. Taking them together enhances calcium absorption, crucial for bone health. No separation time is needed.
Calcium (High Dose) and Magnesium (High Dose): Can You Take Them Together?
High-dose calcium and magnesium can compete for absorption. Separate by 2+ hours if taking >500mg of either. Moderate doses (<300mg) can be taken together.
Folate (High Dose) and Vitamin B12: Can You Take Them Together?
High-dose folate can mask vitamin B12 deficiency, leading to neurological damage. Monitor B12 levels when taking folate. No separation time needed if B12 adequate.
Iodine and Selenium: Can You Take Them Together?
Iodine and selenium have a synergistic relationship. Selenium should be supplemented BEFORE iodine to ensure proper thyroid function. No specific separation time is needed.
Iron and Calcium: Can You Take Them Together?
Iron and calcium compete for absorption. Taking them together can significantly reduce iron uptake. Separate by at least 2 hours for best results.
Iron and Coffee/Tea: Can You Take Them Together?
Iron and coffee/tea can interact, reducing iron absorption. Separate by 1 hour before or 2 hours after coffee/tea to maximize iron benefits.
Iron and Vitamin C: Can You Take Them Together?
Vitamin C significantly boosts iron absorption. Taking them together is safe and beneficial, especially for those with iron deficiency or on plant-based diets.
Iron and Zinc: Can You Take Them Together?
Iron and zinc can interact, reducing absorption of both. Separate by 2+ hours or alternate days. Moderate interaction significance. Learn more.
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Calcium and Vitamin D3: Can You Take Them Together?
Calcium and vitamin D3 have a synergistic relationship. Taking them together enhances calcium absorption, crucial for bone health. No separation time is needed.
Calcium (High Dose) and Magnesium (High Dose): Can You Take Them Together?
High-dose calcium and magnesium can compete for absorption. Separate by 2+ hours if taking >500mg of either. Moderate doses (<300mg) can be taken together.
Folate (High Dose) and Vitamin B12: Can You Take Them Together?
High-dose folate can mask vitamin B12 deficiency, leading to neurological damage. Monitor B12 levels when taking folate. No separation time needed if B12 adequate.
Iodine and Selenium: Can You Take Them Together?
Iodine and selenium have a synergistic relationship. Selenium should be supplemented BEFORE iodine to ensure proper thyroid function. No specific separation time is needed.
Iron and Calcium: Can You Take Them Together?
Iron and calcium compete for absorption. Taking them together can significantly reduce iron uptake. Separate by at least 2 hours for best results.
Iron and Coffee/Tea: Can You Take Them Together?
Iron and coffee/tea can interact, reducing iron absorption. Separate by 1 hour before or 2 hours after coffee/tea to maximize iron benefits.
Iron and Vitamin C: Can You Take Them Together?
Vitamin C significantly boosts iron absorption. Taking them together is safe and beneficial, especially for those with iron deficiency or on plant-based diets.
Iron and Zinc: Can You Take Them Together?
Iron and zinc can interact, reducing absorption of both. Separate by 2+ hours or alternate days. Moderate interaction significance. Learn more.
Magnesium and Vitamin B6: Can You Take Them Together?
Magnesium and vitamin B6 have a synergistic relationship, enhancing each other's effects. No separation time is needed when taking them together.
NAC (N Acetylcysteine) and Glycine: Can You Take Them Together?
NAC and glycine have a synergistic relationship, boosting glutathione production. No separation time is needed, as they work best when taken together.
Vitamin B12 and Folate (5 MTHF): Can You Take Them Together?
Vitamin B12 and folate (5-MTHF) have a synergistic relationship. Taking them together is safe and beneficial, as they support vital bodily functions. No separation time is needed.
Vitamin D3 and Magnesium: Can You Take Them Together?
Vitamin D3 and magnesium have a synergistic relationship. Magnesium is needed to activate vitamin D, so taking them together can improve vitamin D's effectiveness.
Vitamin D3 and Vitamin K2 (MK 7): Can You Take Them Together?
Vitamin D3 and K2 (MK-7) have a synergistic relationship. Taking them together is safe and recommended to ensure proper calcium absorption and utilization.
Vitamin E (High Dose) and Vitamin K: Can You Take Them Together?
High-dose vitamin E can interfere with vitamin K's blood clotting effects. Monitor intake and separate if taking blood thinners to avoid complications.
Zinc and Copper: Can You Take Them Together?
Taking zinc long-term can deplete copper, leading to deficiency. If using zinc supplements, take copper at a separate time to maintain balance and avoid issues.
This information is generated from peer-reviewed molecular databases including the Comparative Toxicogenomics Database (CTD), ChEMBL, and indexed PubMed research. It is not medical advice. Always consult your healthcare provider before making changes to your medications or supplements. See our methodology →