Apigenin is a plant flavonoid primarily found in chamomile, parsley, and celery. As an antioxidant and anti-inflammatory compound, apigenin has drawn the interest of longevity consumers and researchers alike. This article covers what apigenin is, where you get it, how it acts on sleep and NAD+, and what the human evidence says.
Quick Overview
Apigenin is a plant flavonoid. It acts on the GABA-A receptor, the brain’s main calming system, which is why it’s studied for sleep. In cell and animal studies, it’s been shown to block an enzyme called CD38, which raises NAD+. Because NAD+ declines with age, that effect is what drew apigenin into longevity research. Human evidence on both fronts is still limited.
What Is Apigenin?
Apigenin is a flavone, a type of flavonoid antioxidant that gives plants color and helps them handle stress. It is one of the better-studied dietary flavonoids and appears in various fruits, vegetables, and herbs. Most research examines apigenin’s antioxidant and anti-inflammatory activity in cells and animals, its effects in the nervous system, and, more recently, its influence on NAD+ and aging.
Where Apigenin Comes From
Most people associate apigenin with chamomile. However, parsley and celery contain roughly 215 mg and 19 mg per 100 g, respectively, with chamomile and other herbs contributing smaller or more variable amounts.
What you consume is another matter. Purified apigenin has low solubility and poor bioavailability, so even a measured dose delivers less than the number implies. Food and supplements also differ in how much apigenin they contain and in what form: Chamomile tea provides only a few milligrams per cup, while standardized extracts and raw powders are far more concentrated.
How Apigenin Supports Sleep and Calm
The reputation for calm before bed traces back to chamomile tea. A specific receptor mechanism explains the connection, but the human sleep studies are more mixed.
The GABA-A Receptor Connection
GABA is the brain’s main calming signal, and the GABA-A receptor is where benzodiazepines and similar sedatives act.
An early study found apigenin binds the site and calmed anxious mice. A later one found it reduced GABA-activated current and produced no sedation, and its authors doubted GABA-A explained apigenin’s effects. So apigenin clearly binds the receptor; what that does in a person is still unclear.
Human sleep trials mostly use whole chamomile extract rather than purified apigenin, and they disagree. In a double-blind, placebo-controlled study of adults with chronic insomnia, chamomile changed neither total sleep time nor sleep efficiency. In a separate trial, older adults taking it reported better sleep quality. Where a benefit appears, it tends to be modest.
Apigenin, NAD+, and Cellular Aging
Apigenin’s longevity story centers on NAD+, the coenzyme every cell uses for energy and repair. As we age, we produce less NAD+.
How Apigenin Influences NAD+ Levels
An enzyme called CD38 consumes NAD+, and it grows more active with age, which is one reason NAD+ declines. Cell and animal experiments show that apigenin inhibits CD38. When researchers gave apigenin to obese mice, liver NAD+ increased and glucose and lipid markers improved.
That evidence comes from cells and rodents. In humans, one study that measured NAD+ in human immune cells found apigenin did not raise NAD+ levels at all, which raises questions about how directly the mouse findings apply to people.
For the bigger NAD+ picture, see NOVOS’ overview of NAD+ and aging.
Apigenin and the Hallmarks of Aging
Through CD38 and NAD+, apigenin connects to two hallmarks of aging: deregulated nutrient sensing and mitochondrial dysfunction. When NAD+ rises, so does the activity of sirtuins, the repair and energy proteins that depend on it.Â
Other NAD+-raising compounds follow the same logic into longevity stacks, and apigenin appears alongside them. The link is a mechanism observed mostly in preclinical work, not a proven effect on human aging.
Other Researched Benefits of Apigenin
Apart from sleep and NAD+, apigenin acts as an antioxidant and reduces inflammatory signaling in preclinical work, mainly by lowering NF-kB and inflammatory messengers such as TNF-alpha. Those pathways feed into much of age-related biology, and the same effects reach neurons and blood vessels, so researchers also study apigenin for brain and cardiovascular protection. This evidence is again from cells and animals.
Apigenin Dosage, Timing, and Food Sources
Human trials on isolated apigenin are limited, so there is no established dose for the purified compound. The 50 mg to 200 mg figures on supplement labels come from animal studies and theoretical estimates rather than clinical testing.
The human dosing that does exist covers chamomile extract instead, roughly 400 mg to 560 mg a day, split into two doses or taken before bed. Because purified apigenin is unstable and hard to absorb, a standardized extract offers steadier delivery than a loose powder.
For food, chamomile tea and dried parsley are the key sources, with tea limited to a few milligrams per cup.
Apigenin Safety and Side Effects
Food sources of apigenin are safe, and supplement doses are well-tolerated by most people, with occasional mild stomach upset reported. No serious effects have been linked to normal intake.
Apigenin acts on some of the same GABA and enzyme pathways as certain drugs. So, anyone taking sedatives or medications processed through CD38 or liver enzymes should check with a healthcare provider first.
Hormonal effects have also appeared in animals, but only at doses far above anything a person would eat or reasonably supplement. The concern is against megadosing rather than food-level intake.
What the Research Can and Cannot Say
Apigenin has two primary mechanisms: It binds the GABA-A receptor, and it inhibits CD38 to raise NAD+.
Less clear is how much either mechanism matters in people. The sleep evidence relies on chamomile extract rather than apigenin itself. The NAD+ work is preclinical, and at least one human-cell test showed no effect. Poor absorption adds further uncertainty.
For healthy aging, consider a whole-system approach rather than a single flavonoid. NOVOS Core is formulated to address the 12 hallmarks of aging, with ingredients such as glycine and L-theanine that research links to calm and restful sleep. Explore NOVOS Core to see how it fits into a daily longevity routine.
FAQ About Apigenin
What is apigenin, and where is it found?
Apigenin is a plant flavonoid, one of the antioxidant compounds. Parsley and celery are the richest dietary sources, with chamomile and other herbs contributing smaller or more variable amounts.
Does apigenin help you sleep?
It may support sleep by binding a calming receptor in the brain. The human evidence relies on chamomile extract more than apigenin itself, and any effect appears modest.
How is apigenin linked to NAD+?
In cells and animals, apigenin inhibits CD38, the enzyme that breaks down NAD+, thereby increasing NAD+ levels. In one study on human immune cells, though, apigenin did not raise NAD+, so whether it does so in people is unresolved.
Is it safe to take apigenin every day?
It’s considered safe to consume apigenin from food, and most people tolerate supplement doses well. If you take medications or other supplements, check with a healthcare provider first.
What should you not take with apigenin?
Use caution with sedatives or with medications processed through CD38 or liver enzymes, as apigenin acts on the same pathways.
How much apigenin should you take?
There’s no established dose for purified apigenin, because human trials on it are limited. The 50 mg to 200 mg on labels comes from animal and theoretical data rather than clinical research.
Can you get enough apigenin from chamomile tea?
Not at the levels studies use. A cup provides only a few milligrams, well below research doses, because little of the flower’s apigenin reaches the water.
How is apigenin associated with longevity?
Apigenin inhibits CD38 and raises NAD+ in preclinical studies. Because NAD+ decreases with age, that fact connects apigenin to longevity, although the human evidence is not yet there.
