Everything you need to start sleeping better tonight.
Sleep better.
Without melatonin.
A nightly cacao drink that helps your body wind down the way it's supposed to. Made with the right ingredients, at the doses the research is built on. No added hormone. No 3am wake-ups. Just sleep.
Ten ingredients in one nightly cacao drink.
When we built SF Zero, we started with the research and worked backwards. If an ingredient didn't have multiple peer-reviewed human studies behind it, it didn't go in. The bar was real science, real doses, replicated results.
Ten ingredients passed. Four active ones, each clinically proven to do something specific for sleep. Six supporting ones that turn it into a warm cacao you sip before bed. Every dose is on the label. Every batch is third-party tested.
And one we deliberately left out.
Magnesium glycinate
200mg
USA
L-theanine
200mg
Japan
Apigenin
50mg
Egypt
Ashwagandha KSM-66
300mg
India
Natural cacao powder
4g
Peru
Melatonin
0mg
By design
Magnesium glycinate
L-theanine
Apigenin
Ashwagandha KSM-66
Natural cacao powder
Melatonin
New research raises
serious questions.
The research keeps coming in and it suggests melatonin isn't what most people think it is. Three findings from JAMA, Harvard, and the American Heart Association are changing how doctors look at the bottle on your nightstand. And why you should stop using it before it's too late.
It's a hormone. Not a vitamin.
Your brain releases about 0.3mg of melatonin a night. That's all it needs. The gummies on the shelves contain up to 10 times that dose. You're not helping your sleep. You're flooding your body with a hormone it never asked for in the first place.
the dose your body actually needs
The label isn't the truth.
A 2023 JAMA study tested melatonin gummies sold across the US. Almost none of them contained what the label claimed, some had nearly 4 times more. You've been taking blind doses of a hormone for years, and didn't know it.
of US gummies are mislabeled
Short-term help. Long-term harm.
In 2025, the American Heart Association tracked 130,828 long-term melatonin users. They had nearly double the mortality rate and 90% higher risk of heart failure. The damage isn't theoretical, it's measurable, and it's stacking up.
higher heart-failure risk
It's a hormone. Not a vitamin.
Your brain releases about 0.3mg of melatonin a night. That's all it needs. The gummies on the shelves contain up to 10 times that dose. You're not helping your sleep. You're flooding your body with a hormone it never asked for in the first place.
the dose your body actually needs
The label isn't the truth.
A 2023 JAMA study tested melatonin gummies sold across the US. Almost none of them contained what the label claimed, some had nearly 4 times more. You've been taking blind doses of a hormone for years, and didn't know it.
of US gummies are mislabeled
Short-term help. Long-term harm.
In 2025, the American Heart Association tracked 130,828 long-term melatonin users. They had nearly double the mortality rate and 90% higher risk of heart failure. The damage isn't theoretical, it's measurable, and it's stacking up.
higher heart-failure risk
NOT JUST US
I am a strong believer in avoiding taking exogenous melatonin.
Professor of Neurobiology, Stanford School of Medicine
Dr. Huberman has no affiliation with SF Zero. This quote is from a public Stanford Medicine interview.
Claim your free starter kit.
Everything you need to start sleeping better tonight. One 30-serving bag of SF Zero, a milk frother to whip it up properly, an aluminium measuring scoop, and free monthly delivery so you never run out. Plus a free gift in your second box. Yours for the price of the bag alone.
WHAT PEOPLE ARE SAYING
Real customers. Real ritual. Real results.
Join thousands of people who've replaced melatonin gummies with a nightly cacao that actually works, and tastes like something to look forward to.
OUR PROMISE
30-night sleep guarantee.
Try SF Zero for 30 nights. If you don't feel the difference, you'll get your money back.
Frequently Asked Questions
What is SF Zero?
SF Zero is a nightly cacao drink designed to help your body sleep better, without using melatonin. You stir one scoop into warm milk or water about twenty minutes before bed. Inside the bag are ten ingredients chosen for what actually helps the body wind down: four active ones at clinical doses: magnesium glycinate, L-theanine, apigenin, and ashwagandha KSM-66 and six supporting ones, including real cacao, that turn the formula into something you'd actually want to drink. Every milligram is printed on the bag and every batch is third-party tested.
What makes SF Zero different from other sleep products?
Most sleep supplements lean on melatonin, the hormone your body already produces in tiny amounts. The doses on the shelf are often ten to thirty times what your brain actually makes, and the research on long-term use is increasingly concerning. SF Zero is built on the opposite idea: your body already knows how to sleep, it just needs the right building blocks. We chose four active ingredients backed by replicated human studies, dosed them at the levels real research uses, and put every milligram on the label. No melatonin, no proprietary blends, no fillers we couldn't justify.
Is it safe to drink every night?
Yes. All ten ingredients are at doses supported by peer-reviewed research for nightly use, and none of them are habit-forming. SF Zero contains no hormones, no sedatives, and nothing your body builds tolerance to. Every batch is third-party tested for purity and dose accuracy. If you're pregnant, nursing, or taking medication, we'd recommend checking with your doctor first, the same advice that applies to any supplement.
How long until I notice a difference?
Most people feel something the first night, falling asleep faster, a calmer mind, less of the racing-thought loop. The deeper effects tend to land in the second week as the magnesium and ashwagandha build up in your system. Sleep is a longer-term habit, not a single dose, so we recommend giving it the full thirty nights before deciding whether it works for you. If by then you don't notice a meaningful difference, the bag is on us.
What if it doesn't work for me?
Then it's free. Every order comes with a 30-night sleep guarantee. Full refund, and you keep the bag. If you're on a subscription, you can cancel it in one click from your account dashboard. No phone calls, no retention emails, no friction. Sleep is personal, and we'd rather you find what works for you than feel locked into something that doesn't.