Supplement-Medication Interaction Checker

Important: This is educational information. Always consult your doctor or pharmacist before starting supplements with medications.

Read this first: 6 medications that almost always need a paired supplement

These are the prescriptions where supplementing isn’t optional — the medication actively depletes a nutrient and the depletion drives the side effects people complain about. If you’re on any of these and not supplementing the paired nutrient, this is the highest-leverage change you can make.

One spacing rule for everything else: if you take Levothyroxine (Synthroid) or an antibiotic from the tetracycline or fluoroquinolone families, separate them from Calcium, Iron, Magnesium, and multivitamins by 4 hours. That single habit prevents the most common supplement-blocks-medication interaction.

Quick Start: Search Your Medication

Use the searchable table below to find your medication and see:

• ✅ Which supplements are SAFE to take
• ❌ Which supplements to AVOID
• 🔄 Nutrient depletions caused by your medication
• 📖 Link to detailed protocol guide

Medications A-Z with Supplement Information

A - Cardiovascular Medications

ACE Inhibitors (Lisinopril, Enalapril, Ramipril)

• Safe: Magnesium ⭐, Vitamin D3, Omega-3, B vitamins
• Avoid: Potassium supplements (usually), High-dose sodium
• Depletion: Zinc (minor)
• Spacing: None required
• Details: Full guide | Seek prescription details

Atorvastatin (Statin)

• Safe: CoQ10 ⭐⭐ (critical), Magnesium, Vitamin D3, Red yeast rice
• Avoid: High-dose niacin
• Depletion: CoQ10 (most important), B vitamins
• Spacing: None required
• Details: Full guide | Take CoQ10 150-300 mg daily

Aspirin

• Safe: Vitamin C, Magnesium, Omega-3, Probiotics
• Avoid: High-dose vitamin E (bleeding risk)
• Depletion: Iron, B vitamins, Folate
• Spacing: None required
• Details: Full guide

B - Diabetes Medications

Metformin

• Safe: B12 ⭐, Alpha-Lipoic Acid, CoQ10, Magnesium
• Avoid: High-dose niacin, Contrast dye (medical procedures)
• Depletion: B12 (critical), Folate, CoQ10
• Spacing: 2-4 hours from supplements (not required but helps)
• Details: Full guide | B12 must be supplemented or monitored

Glipizide, Glyburide (Sulfonylureas)

• Safe: Magnesium, B vitamins, Chromium
• Avoid: Stimulating supplements
• Depletion: B vitamins, CoQ10
• Spacing: None required
• Details: Full guide

C - Cardiovascular (Continued)

Levothyroxine (Synthroid - Thyroid)

• Safe: Most (with proper spacing) | B vitamins, Vitamin D3
• Avoid: Calcium, Iron, Magnesium (without spacing), Soy
• Depletion: Iron (if deficient)
• Spacing: 4+ hours required from Calcium, Iron, Magnesium
• Details: Full guide | Take medication on empty stomach; supplements later

Lisinopril - See ACE Inhibitors above

Losartan (ARB)

• Safe: Magnesium, Vitamin D3, Omega-3
• Avoid: Potassium supplements, High-dose sodium
• Depletion: Minimal
• Spacing: None required
• Details: Full guide

D - Mental Health Medications

Escitalopram, Sertraline (SSRIs)

• Safe: Omega-3 ⭐, Magnesium, Probiotics, B vitamins
• Avoid: 5-HTP, L-Tryptophan (serotonin syndrome risk), St. John’s Wort
• Depletion: Folate, B vitamins
• Spacing: None required
• Details: Full guide | Omega-3 may enhance SSRI effectiveness

M - Mental Health / General

Metoprolol (Beta Blocker)

• Safe: CoQ10 ⭐, Magnesium, Omega-3
• Avoid: Stimulants (ephedrine, high-dose caffeine)
• Depletion: CoQ10, Melatonin, Magnesium
• Spacing: None required
• Details: Full guide | CoQ10 important

Metformin - See Diabetes above

P - Anti-Inflammatory / Steroids

Prednisone (Corticosteroid)

• Safe: Calcium ⭐, Vitamin D3 ⭐, Magnesium, Probiotics, B vitamins
• Avoid: High-dose potassium, Alcohol
• Depletion: Calcium (critical), D3 (critical), K, B vitamins, Zinc
• Spacing: None required
• Details: Full guide | Supplementation essential - high depletion

Pravastatin - See Statins above

S - Statins / Sleep

Sertraline - See SSRIs above

Simvastatin - See Statins above

Synthroid - See Levothyroxine above

W - Blood Thinners

Warfarin (Coumadin)

• Safe: Most (with doctor approval) | Magnesium, B vitamins
• Avoid: Vitamin K supplements, High-dose Omega-3, Ginkgo, Garlic
• Depletion: Vitamin K (paradoxically - needs monitoring)
• Spacing: Consistent (no spacing needed but consistency critical)
• Details: Full guide | Foods/supplements with vitamin K affect INR

Apixaban (Eliquis) - Modern Blood Thinner

• Safe: Most supplements | Omega-3, Magnesium, B vitamins
• Avoid: Very high-dose Omega-3 (>3g), Ginkgo (large doses), Garlic (large doses)
• Depletion: Minimal
• Spacing: None required
• Details: Full guide | More forgiving than Warfarin

Medication Category Quick Reference

Don’t see your specific medication above?

Browse by category:

• Cardiovascular Medications
• Thyroid Medications
• Diabetes Medications
• Blood Thinners (Anticoagulants)
• Corticosteroids
• Antibiotics

Or view complete medication guide list

General Safety Rules

✅ ALWAYS SAFE (Usually)

These are safe with almost all medications:

• Magnesium (unless on specific drugs)
• Vitamin D3 (unless on specific drugs)
• Vitamin C (universal compatibility)
• B vitamins (universal compatibility)
• Probiotics (universal compatibility)
• Omega-3 fish oil (check with blood thinners only)

⚠️ CHECK FIRST (Variable by medication)

• Calcium (interferes with antibiotics, thyroid meds)
• Iron (interferes with many medications)
• Vitamin K (problematic with blood thinners)
• Ginkgo (may increase bleeding risk)
• Garlic (high-dose with blood thinners)
• High-dose herbs (always check first)

❌ USUALLY AVOID

• Supplement herbs without doctor approval
• High-dose vitamins (if not tested for deficiency)
• St. John’s Wort (interferes with many drugs)
• Unregulated supplements (quality concerns)

Spacing Guidelines (If Interaction Exists)

If a supplement interacts with your medication, spacing can help:

Example Protocol:

• 8:00 AM: Levothyroxine (on empty stomach)
• 12:00 PM: Lunch
• 1:00 PM: Calcium, Iron, Magnesium supplements
• 6:00 PM: Dinner
• 7:00 PM: Other supplements

Nutrient Depletions by Medication

Your medication may deplete nutrients. Supplementation may be needed:

Before Starting Supplements: Checklist

Follow this process:

☐ 1. Find your medication above (or in category guides)

☐ 2. Note safe supplements (the ones with ✅)

☐ 3. Consult your pharmacist

• Show them the safe list
• Ask about spacing (if applicable)
• Mention all supplements you’re considering

☐ 4. Get tested (Important!)

• If your medication depletes nutrients, request testing
• Don’t supplement blind
• Common tests: B12, D3, Iron, Folate, Magnesium

☐ 5. Space properly (if interaction exists)

• Set phone reminders
• Write down your timing schedule
• Consistency matters

☐ 6. Monitor

• Note how you feel
• Report any symptoms to doctor
• Most combinations work fine

Need More Details?

For each medication, read the full guide:

• Thyroid Medication Guides
• Anticoagulant Guides
• Diabetes Medication Guides
• Corticosteroid Depletion Guide
• Antibiotic Guides

For supplements by goal:

• Browse all goals
• Browse by health condition

Important Disclaimers

⚠️ This is educational information, not medical advice

• Individual responses vary
• New research emerges constantly
• Your doctor knows your complete health picture better

✅ Always:

• Tell your doctor ALL supplements you take or plan to take
• Get pharmacist approval before starting
• Don’t stop medications to take supplements
• Report any new symptoms to your doctor
• Get tested for deficiencies before supplementing

❌ Never:

• Assume no interaction without checking
• Start high-dose supplements without testing
• Replace medications with supplements
• Skip this checker because “it’s probably fine”

Your Doctor/Pharmacist is the Best Resource

This tool covers common interactions. For your specific medications and health situation:

1. Ask your pharmacist (best source for interactions)
2. Consult your doctor (best source for your health)
3. Use FDA/NIH databases (authoritative sources)
4. Read our detailed guides (supplementary information)

Ready to Find Your Supplements?

1. Use the checker above to find safe supplements
2. Click detailed guide links for complete protocols
3. Consult your doctor/pharmacist
4. Start supplementing safely

Browse all medications → | Browse by goal → | Browse by condition →