Calculate apigenin dose by goal — sleep (Huberman 50 mg protocol), longevity / CD38 inhibition, anxiety. Most “chamomile tea sleep” effect is from apigenin’s GABA-A binding. Math, not medical advice.
Your goal
50 mg/day
Apigenin target
1
capsule
Food sources (apigenin per serving)
| Food | Serving | Apigenin (mg) |
|---|---|---|
| Fresh parsley (highest food source) | 1 cup chopped | ~45 mg |
| Dried parsley | 1 tbsp | ~5-10 mg |
| Chamomile tea (steeped) | 1 cup | ~1-3 mg |
| Celery leaves | 1 cup chopped | ~5 mg |
| Artichoke | 1 medium | ~1-2 mg |
| Oregano (dried) | 1 tsp | ~1 mg |
| Average Western diet | daily | ~0.5-2 mg total |
Most dietary apigenin comes in glycoside form (bound to sugar), which has different absorption than the aglycone form in supplements. Bioavailability of dietary apigenin is poor; supplement form is more concentrated.
Mechanism — how apigenin works
- GABA-A receptor binding: apigenin binds benzodiazepine site (without benzo addiction risk) — this is the sleep/anxiety mechanism.
- CD38 inhibition: apigenin inhibits CD38, an enzyme that degrades NAD+. By blocking CD38, apigenin theoretically preserves cellular NAD+ levels — longevity claim.
- Aromatase inhibition: mild — reduces conversion of testosterone to estrogen. Used by some bodybuilders / men with concerns about estrogen.
- Antioxidant + anti-inflammatory: flavone with broad in-vitro effects.
- BCRP / P-glycoprotein effects: can affect drug absorption (especially statins, oncology drugs).
The Huberman sleep stack
Andrew Huberman’s popularized pre-bed sleep stack:
- 50 mg apigenin (GABA-A modulation)
- 145 mg magnesium L-threonate OR 200-300 mg magnesium glycinate
- 100-400 mg L-theanine (alpha brain waves)
- Take 30-60 minutes before bed
- Honest take: the stack is plausible but none of these have specifically been RCT-tested AS a stack. Individual components have varying levels of evidence. Anecdotally popular; modest effect for many users.
Side effects and drug interactions
- Generally well-tolerated at 50 mg/day. Mild stomach upset in some.
- Estrogenic activity: Mild — generally avoid with hormone-sensitive cancers (breast, prostate, ovarian, endometrial) without oncology coordination.
- Drug interactions: apigenin is a CYP inhibitor and affects drug transporters. May interact with statins, oncology drugs, immunosuppressants, BP meds. Discuss with prescriber.
- Pregnancy: avoid — uterine effects in some studies.
- Bleeding risk: mild antiplatelet activity. Discontinue 1-2 weeks before surgery.
- Don’t drive after first dose: due to GABA-A activity, possible sedation. Test on a non-driving evening first.
