The World’s Most Famous Greens Powder Has Exactly One Clinical Trial — Its Own

Creatine monohydrate has 500+ randomized trials. Fish oil has hundreds. The world’s most famous greens powder — a product selling at up to $99 a month — has exactly one: 30 participants, four weeks, funded by the manufacturer, with two of its authors on the company’s payroll. It found mild microbiome shifts and good tolerability. No energy, immunity or performance outcomes. No independent replication. No trial anywhere showing it beats a basic multivitamin.

That doesn’t make AG1 a scam — our own review scores it 9.2 for formulation quality and third-party testing. It makes it an evidence question: what exactly are you paying ~$3.30 a day for?

The vitamin math your kidneys already know

One scoop delivers 917% of your daily B12 and 467% of your vitamin C. Water-soluble vitamins don’t stockpile: vitamin-C absorption saturates near 200 mg — beyond that, urinary excretion rises steeply (Levine 1996) — and B12 absorption is capped by intrinsic factor, so megadoses mostly pass through. A $0.05 multivitamin covers the same micronutrient bases.

The greens themselves sit in a 7.4 g proprietary blend spanning 20+ ingredients. One studied dose of spirulina alone (1–8 g in trials) wouldn’t fit — so no ingredient in that blend can plausibly be at its researched dose.

The honest bottom line

• Love the all-in-one morning ritual and don’t mind paying? AG1 is well-made — enjoy it.
• Want disclosed doses instead of proprietary blends? Jocko Fuel leads our ranking at 9.4.
• Just want the micronutrient gap covered? A multivitamin plus actual vegetables costs ~$1.10 a day.