Apigenin and Cellular Senescence: Evidence and Dosing

Expert Summary

Apigenin's most pharmacologically significant activity in aging is CD38 inhibition — with an IC50 of approximately 0.7 μM, far more potent than quercetin (20 μM) for CD38 inhibition. This makes apigenin a uniquely effective NAD+ preservation supplement at low doses. At higher doses, apigenin also inhibits BCL-2 family proteins with senolytic potential.

Key Facts

• CD38 inhibition IC50: 0.7 μM for apigenin vs 20 μM for quercetin. Apigenin achieves meaningful CD38 inhibition at plasma concentrations achievable with ~50–100 mg/day supplementation — far lower than quercetin requires for equivalent CD38 inhibition.
• NAD+ preservation: By inhibiting CD38, apigenin reduces the primary enzymatic consumption of NAD+ in aging immune cells. This is additive with NMN/NR supplementation (apigenin reduces consumption; NMN/NR increases production).
• Senolytic activity: At 50–100 μM (above typical supplemental plasma levels), apigenin inhibits BCL-2 and BCL-XL. This senolytic activity may occur at high-dose supplementation but is less efficiently achieved than with quercetin or fisetin at standard doses.
• Anti-SASP: Apigenin potently inhibits NF-κB, reducing SASP cytokine production. This anti-SASP activity may be its most important aging benefit at standard supplemental doses.
• Food sources: Chamomile tea (rich in apigenin glycosides — apigenin-7-glucoside), parsley (dried: 4500 μg/g), celery leaves, and artichokes. Chamomile tea provides ~3–10 mg apigenin per cup.
• Bioavailability: Apigenin glycosides from food have moderate bioavailability (~25%) via glucose transporters. Aglycone apigenin supplements have lower bioavailability.

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Frequently Asked Questions

Can chamomile tea provide therapeutic apigenin doses?

Chamomile tea provides 3–10 mg apigenin per cup. For CD38 inhibition at the 0.7 μM IC50, plasma apigenin levels from tea consumption may approach meaningful CD38-inhibitory concentrations. 3–4 cups/day of strong chamomile tea is a reasonable dietary strategy.

Should I take apigenin if I'm already taking quercetin?

Apigenin and quercetin have complementary activity — apigenin is better for CD38 inhibition; quercetin is better for senolytic activity. Combining them provides broader coverage without redundancy.

Scientific References

• Boslett J et al. Apigenin is the most potent inhibitor of CD38 among flavone and flavonol compounds. Journal of Biological Chemistry. 2017. PMID: 29187603