Apigenin for Anxiolysis & NAD+ Preservation — Brain
Natural flavonoid with anxiolytic GABA-A modulation and CD38 inhibition that may preserve NAD+ levels; emerging evidence for sleep and cellular health.
Overview
Apigenin (4',5,7-trihydroxyflavone) is a natural flavonoid abundant in chamomile, parsley, celery, and many other plants. It has attracted dual interest in neuroscience and longevity research due to two distinct pharmacological properties. First, apigenin is a selective modulator of GABA-A receptors — specifically binding to the benzodiazepine binding site on GABA-A receptors with partial agonist activity. Unlike benzodiazepines, apigenin produces anxiolytic and mild sedative effects without significant motor impairment, amnesia, or dependence. This explains the traditional use of chamomile tea for relaxation and sleep. Chamomile extract standardized to apigenin has been studied in a randomized, double-blind, placebo-controlled trial for generalized anxiety disorder (GAD), showing significant reduction in Hamilton Anxiety Rating Scale scores. Second, apigenin is a potent inhibitor of CD38, an NADase enzyme that is the primary consumer of NAD+ in mammalian cells. NAD+ levels decline by approximately 50% between ages 25-65, contributing to metabolic dysfunction and aging. By inhibiting CD38, apigenin may preserve intracellular NAD+ pools, supporting sirtuin activity and mitochondrial function. This positions apigenin at the intersection of sleep medicine and longevity science. Doses of 50-100 mg (equivalent to consuming 10-20 cups of chamomile tea) are commonly supplemented.
Indications
- Emerging evidence: Anxiolysis and stress reduction (GABA-A modulation)
- Moderate evidence: Generalized anxiety disorder (GAD) adjunctive treatment (chamomile extract)
- Emerging evidence: Sleep quality improvement (mild sedative effects)
- Emerging evidence: NAD+ preservation through CD38 inhibition
- Preclinical: Anti-inflammatory effects (NF-kB suppression)
- Preclinical: Neuroprotection and cognitive preservation
Mechanism of Action
Apigenin binds to the benzodiazepine site on GABA-A receptors as a partial agonist, enhancing chloride channel opening and inhibitory neurotransmission without full benzodiazepine-like effects
Dosing
| Compound | Dose | Frequency | Notes |
|---|---|---|---|
| Apigenin (pure) | 50 mg | Once daily at bedtime | Standard dose for anxiolytic and sleep support |
| Apigenin (pure) | 100 mg | Once daily at bedtime | Higher dose; may enhance CD38 inhibition and NAD+ preservation |
| Chamomile extract (standardized to 1.2% apigenin) | 500 mg | Three times daily | GAD trial protocol (Mao et al.); ~18 mg total apigenin per day |
Evidence Grade
GRADE B
Safety & Contraindications
- Excellent safety profile — chamomile has been consumed for millennia
- Mild sedation possible — avoid driving or operating machinery until effects are known
- Rare allergic reactions in individuals with Asteraceae/Compositae family allergies (ragweed, chrysanthemum)
- Theoretical CYP1A2, CYP3A4 interaction at very high doses — unlikely at standard supplemental doses
- May potentiate effects of benzodiazepines and other sedatives
- Pregnancy/lactation: chamomile tea generally considered safe; high-dose supplements lack data