THE PLANT
ONE INGREDIENT -- THOUSANDS OF YEARS IN THE MAKING
South Africans have been turning to Sceletium Tortuosum for centuries.
We found the best version of it and put it in a can.
WHAT IS KANNA?
NOT ALL KANNA IS ZEMBRIN® BUT OURS SURE IS.
Zembrin® is a patented extract of Sceletium tortuosum — a succulent native to South Africa, more commonly known as kanna. The Khoi-San people have turned to it for thousands of years to lift their spirits, ease their minds, and take the edge off the long stretches. In 1705, explorer Peter Kolbe called it “the greatest cheerer of the spirits.” He wasn’t wrong.
Zembrin® isn’t just any kanna. It’s a specific, patented cultivar — one proprietary strain, extracted in one precise way — to produce the same alkaloid profile in every single batch. The same plant, the same extraction, the same experience, in every can. Nobody else can source it and nobody else can make it. We use it because it’s simply the best version of this ingredient that exists.
THE SCIENCE (WITHOUT THE HEADACHE)
BACKED BY SCIENCE
Zembrin® has been through multiple double-blind, placebo-controlled human clinical trials. What they found: measurable reductions in stress response, brighter mood, clear-headed calm, and social ease — conversation comes a little easier, and you’re more present in the room. Basically you, but better. Plus, it's fast-acting — most people feel it within 20–30 minutes — and non-sedating.
No fog. No crash. No altered state. Just warm, clear, easy.
This is exactly why we use one ingredient instead of ten. Because one ingredient that’s been rigorously studied beats a stack of things that haven’t been. You know what you’re feeling, and you know why.
to feel it
published clinical trials
sedation
next-day regret
SEED TO CAN
A BETTER INGREDIENT HAS A BETTER STORY
Sceletium tortuosum is a protected species — wild harvesting isn’t sustainable and isn’t legal for commercial use. Zembrin® is grown through a seed-to-shelf program: every plant traceable from an individual seed, verified against the Zembrin® alkaloid “fingerprint” before it ever reaches production. What goes in the can is exactly what the clinical studies used.
Zembrin® was awarded Bioprospecting Export Permit #001 from the South African government — the first ever issued for Sceletium tortuosum. It’s endorsed by the South African San Council, who hold the cultural and traditional knowledge of this plant. And for every unit sold, the San community receives a royalty.
When you crack open an On The Brightside™, you're doing more than drinking a soda — you're supporting the very community that's stewarded this plant for generations, with a little of every sale going right back to them.
WHAT TO EXPECT
HERE’S THE ARC
ONE
THE FIRST TWENTY MINUTES
Crack one open cold from the fridge — Zembrin® is already working. Most people feel the first wave somewhere around 20 minutes in, and it's a subtle shift, not a dramatic one: shoulders loosen, mind quiets just enough to notice.
TWO
THE SWEET SPOT
This is what golden hour actually feels like: warm, easy, and carefree. Music sounds a little better, conversation comes a little easier, and you're entirely yourself, just a calmer, brighter version. Non-sedating, non-intoxicating, completely in control.
THREE
THE ARC
No crash on the other side. The feeling lasts somewhere in the 1–2 hour range for most people, then fades clean — no hangover, no fog, no reason to feel any different tomorrow than you do right now.
FAQS
A FEW THINGS PEOPLE ASK
Golden hour on demand raises a few questions. Fair! Here's everything you want to know before your first sip.
MORE QUESTIONS? WE’VE GOT ANSWERS.
A warm lift without the weight, ease without the haze. It's like that golden hour feeling — when everything's a little easier and nothing in particular needs fixing. Conversation flows easier, music sounds better, and your shoulders drop somewhere you forgot they could go. Basically, unbothered and feeling good.
Yes! That's the whole point. A lot of functional drinks ask you to take something for six business weeks and hope for the best. We didn't love those odds. On The Brightside™ is powered by Zembrin®, a science-backed extract of kanna, and most people feel it within 20-30 minutes. Warm, clear, easy - not dramatic, not intoxicating. Just that golden hour feeling, on demand.
Zembrin® is a patented, science-backed extract of a South African succulent (Sceletium tortuosum, also known as kanna) that's been used for centuries for calm, mental clarity, and social ease. What makes Zembrin® different: it's derived from a specific, proprietary cultivar that nobody else can use -- same strain, same extraction, same experience every single time. Not all kanna is Zembrin®, but ours sure is.
Because one great thing done right beats ten mediocre things done vaguely. Every other brand in this space stacks ashwagandha, magnesium, lion's mane, L-theanine, and whatever else was in the trend report. Stack enough things and maybe something works? Maybe. On the Brightside™ uses one ingredient — Zembrin®— so you know exactly what you're feeling. And with us, you actually will.
Nope. Zembrin® is non-sedating, non-intoxicating, and has no known anxiety-inducing effects. In fact, it's science-backed for the opposite. You'll feel warm, clear, and chill, not foggy or altered. No buzz, no crash, no next-morning regret. You're completely in control — just a calmer, easier, more golden version of yourself.
Anytime! Morning meeting, afternoon slump, first date jitters, that night out where you want to be present and not sloppy — or just whenever someone's testing your patience and you'd rather stay chill and unbothered. On the Brightside™ is non-sedating and caffeine-free, so there's no wrong time to crack one open. The golden hour is whenever you want it to be.
NOW THAT YOU KNOW THE INGREDIENT, IT'S TIME TO FEEL IT
