A lot of us ask what melatonin actually does. It's cheap, it's everywhere, and it's become the default answer to a problem it was never really built to solve.
In late 2025, a study presented at the American Heart Association's Scientific Sessions landed with a thud in the wellness world: long-term melatonin use was linked to higher rates of heart failure, related hospitalisation, and all-cause mortality in people with chronic insomnia. The researchers were careful - this is an association, not proof that melatonin causes heart problems. But it's the kind of headline that makes you think.
So let's talk about what melatonin is actually for, what the Reishi mushroom does instead, and why "which one is better" is the wrong question. The right one is: which problem are you actually trying to solve?
Melatonin Was Never Meant to Knock You Out
Melatonin is a hormone, not a sedative. Your body makes it naturally as light fades, and it's the signal that tells your internal clock "night has started". It's a timing tool. Brilliant for jet lag, shift work, or resetting a clock that's drifted. Less brilliant as a nightly crutch for a nervous system that's wound too tight to switch off in the first place.
The part that gets buried under the wellness-aisle marketing is: most melatonin products contain 5–10mg per dose. The research behind melatonin's actual effectiveness supports something closer to 0.5–1mg. Oversized doses, real hormone. It's the same dosing sleight of hand that shows up across half the supplement aisle, just less talked about because melatonin still feels "natural" and harmless.
Add the new cardiovascular signal on top of that, and "just take melatonin" starts to look like advice that deserves a second thought - especially for the chronic, every-single-night users the AASM has already cautioned against for years. Sleep bodies have recommended against routine melatonin use for chronic insomnia for a while now. This latest study just gave that caution a sharper edge.
Where Reishi Mushroom Fits - and Where It Doesn't
Reishi isn't a melatonin replacement. It works on an entirely different system.
Reishi is an adaptogen. Instead of sending your body a direct hormonal signal, it's studied for its effect on the HPA axis - the stress-response system that governs cortisol. Triterpenes in Reishi are associated with a calming effect on this axis, which matters because elevated evening cortisol is one of the quieter reasons people lie awake at night.
That's the real distinction. Melatonin resets timing. Reishi supports the body's ability to downshift out of stress mode so sleep can happen on its own terms. One tells your body what time it is. The other helps your body actually believe it's safe to stop being "on."
Neither is a sedative. Neither should knock you out cold. And that's the point - the goal isn't unconsciousness, it's a nervous system that isn't fighting you on the way there.
Two Different Tools, Two Different Problems
This isn't an anti-melatonin piece. Melatonin has a real, evidence-backed use case: circadian misalignment. Long-haul flights. Night shifts rotating back to days. A body clock that's genuinely confused about what time zone it's in.
But if your sleep problem is "I can't switch off," not "my clock is wrong," you're reaching for the wrong tool - and, per the new research, possibly one with downsides you didn't sign up for.
Reishi's lane is the low-grade, everyday version of sleeplessness: the kind driven by stress, overstimulation, and a brain that won't stop narrating. It's slower to feel and less dramatic in effect, because it's not trying to override your biology. It's trying to support it.
Building a Sleep Stack That Doesn't Backfire
If you're going to build a stack instead of reaching for a single fix, here's what actually earns a place in it:
Reishi - for the stress-driven wired-but-tired loop, taken consistently rather than as an emergency measure.
Magnesium - genuinely one of the more evidence-backed minerals for sleep quality and muscle relaxation, and something a lot of modern diets are quietly short on.
Passion Flower - traditionally used to ease the mental chatter that keeps you scrolling ten minutes past when you meant to put the phone down.
Actual sleep hygiene - the unglamorous stuff: consistent bedtime, less light exposure late in the evening, less doom-scrolling. No adaptogen outworks a 1am TikTok spiral.
This is roughly the combination behind our Adaptogen Soda: Reishi Mushroom, Passion Flower, and Magnesium, dosed to match the research rather than the marketing.
Key Takeaways
Melatonin is a circadian timing tool, most effective at 0.5–1mg - far below what most products actually contain, and now facing fresh scrutiny after research linking long-term use to heart health risks.
Reishi works differently, supporting the body's stress-response system rather than overriding your sleep-wake signal directly.
The better question isn't "which supplement wins" - it's whether your sleep problem is a clock problem or a stress problem, because each needs a different answer.
A stack that pairs Reishi, Magnesium, and Passion Flower with real sleep hygiene tends to outperform any single ingredient taken alone.
Sleep aids aren't one-size-fits-all, and the newest melatonin research is a good reminder that "natural" doesn't always mean "no downside." If your nights are more wired-brain than wrong-time-zone, it might be worth rebalancing rather than overriding.
Our Adaptogen Soda was built for exactly that - real doses with nothing hidden on the label. Explore our Adaptogen Soda here.
Sources referenced:
- American Heart Association, Scientific Sessions 2025 — melatonin and long-term cardiovascular risk findings
- American Academy of Sleep Medicine (AASM) guidance on melatonin and chronic insomnia