Does NAD+ Help With Cortisol or Stress Levels?

NAD+ doesn't switch cortisol off on command, but the two are connected at a cellular level. Cortisol is the body's primary stress hormone, and producing, regulating, and clearing it depends partly on NAD+-fuelled cellular energy and a family of NAD+-dependent enzymes called sirtuins. Some early research suggests that when stress becomes chronic, the body's NAD+ reserves come under extra pressure — which is why NAD+ and cortisol levels are increasingly discussed together in longevity and wellness circles, even though the underlying science is still developing.

What Is Cortisol, and Why Does the Body Need NAD+ to Manage It?

Cortisol is released by the adrenal glands as part of the hypothalamic-pituitary-adrenal (HPA) axis, the body's central stress-response system. In short bursts, cortisol is useful — it mobilises energy, sharpens focus, and helps the body respond to a genuine challenge. Producing that response, and then switching it back off again, is metabolically demanding work. Cells rely on NAD+ as a core currency for generating usable energy (ATP), so a body under repeated stress is, in effect, asking its NAD+-dependent energy systems to work harder and more often.

The Science Behind NAD+ and Cortisol Levels: What Sirtuins Have to Do With It

Sirtuins are a family of enzymes — SIRT1 is the most studied — that cannot function without NAD+ as a cofactor. A 2018 review in Frontiers in Endocrinology described SIRT1 as central to HPA-axis signalling: it supports processing of the precursor to corticotropin-releasing hormone (CRH) in the brain, and it's involved in the adrenal cortex's own hormone-producing machinery. In other words, the body's capacity to mount and regulate a cortisol response is partly tied to how much NAD+-dependent enzyme activity is available to it. That's a mechanistic link, not proof that raising NAD+ levels changes how someone experiences stress — the research sits at the pathway level, not yet at the level of measured outcomes in people taking NAD+ supplements or injections. For a related look at how NAD+ intersects with brain function, see our article on NAD+ and brain fog.

Chronic Stress May Add to the Body's NAD+ Workload

Cellular stress — including the oxidative stress associated with prolonged psychological stress — is understood to activate NAD+-consuming repair pathways alongside the sirtuins that draw on the same NAD+ pool. Some researchers describe this as the body's stress-response and repair systems effectively competing for a shared, finite resource. This is proposed biology rather than a measured clinical effect, but it offers one plausible explanation for why chronic stress and age-related NAD+ decline are often discussed in the same breath. It's also one reason poor sleep and constant stress are considered a difficult combination for cellular energy metabolism generally — our article on NAD+ and sleep looks at that connection in more detail. For context on why this matters at a population level, the Mental Health Foundation's own research has found that around 74% of UK adults have, at some point, felt so stressed they were unable to cope.

What This Means If You're Considering NAD+ Injections for Stress Support

NAD+ injections aren't a treatment for stress, anxiety, or any diagnosed condition, and no supplement can substitute for addressing the practical or psychological sources of chronic stress. What the current research does support is a plausible biological link between cellular NAD+ availability and the machinery involved in the body's stress response — which is why some people exploring NAD+ supplementation frame it as general support for cellular energy metabolism, used alongside rather than instead of sleep, movement, and stress management. If you take medication for a stress-related or endocrine condition, or you're managing a diagnosed health issue, speak with your GP or prescriber before adding any new supplement or injectable therapy.

Frequently Asked Questions

Can NAD+ lower cortisol directly?

There's no clinical evidence that NAD+ supplementation directly lowers cortisol levels in humans. The research connecting NAD+ to cortisol regulation sits at the level of cellular pathways and enzyme activity, such as sirtuins, rather than measured hormone outcomes from taking a supplement or injection.

Is there a clinical trial showing NAD+ reduces stress?

Not yet. Most of the evidence linking NAD+ to the stress response comes from cellular and animal studies of sirtuin biology and the HPA axis. Human trials looking specifically at NAD+ supplementation and perceived stress or cortisol output are limited, so any connection should be treated as an area of ongoing research rather than an established effect.

Could stress be part of why my NAD+ feels low?

It's plausible based on the mechanisms discussed above, but there's no reliable way to measure your own cellular NAD+ status outside a lab setting, and stress is only one of many factors — including age, diet, alcohol intake, and sleep — thought to influence NAD+ levels.

Should I use NAD+ instead of managing stress through lifestyle changes?

No. NAD+ injections aren't positioned as a replacement for addressing the sources of chronic stress or for foundational habits like sleep, exercise, and nutrition. Most people considering NAD+ supplementation use it alongside those changes, not instead of them.

Can I combine NAD+ with medication I take for stress or anxiety?

Speak with your GP or prescriber before combining NAD+ with any prescription medication, including anything prescribed for stress, anxiety, or sleep — this matters most if the medication affects hormone levels or the central nervous system.

This article is for general informational purposes only and does not constitute medical advice. Always speak with a qualified healthcare professional before starting any new supplement or injectable therapy.