AG1 is a greens powder that contains 75 vitamins, minerals, probiotics, and plant extracts in a single daily scoop. Whether it’s “good for you” depends on what you expect it to do. A 2026 clinical trial found it can fill a few nutritional gaps and modestly shift gut bacteria in a favorable direction, but it delivers only 2 grams of fiber per serving and won’t replace the benefits of eating actual fruits and vegetables.
What the Clinical Evidence Shows
For years, AG1’s marketing outpaced its science. That changed with a randomized, double-blind, placebo-controlled crossover study published in Frontiers in Nutrition. Twenty resistance-trained adults took either AG1 or a placebo for two weeks, then switched. The results were modest but real: AG1 closed an average of 1.4 nutrient gaps per person compared to placebo, with vitamins A, C, and E being the most common deficiencies it corrected. Overall, the AG1 group met the estimated average requirements for about 2.8 more nutrients than the placebo group.
The same study looked at gut bacteria. AG1 didn’t cause large shifts in overall microbial diversity, but it did selectively increase several bacterial species associated with gut health, including strains of Lactobacillus and Bifidobacterium. Stool samples also showed increases in beneficial plant compounds like genistein (a polyphenol) and decreases in byproducts of protein fermentation, which are generally considered less desirable in the gut. One important caveat: participants reported no improvement in digestive quality of life over the two-week period compared to placebo.
This is a single study with 20 participants over 14 days. It tells us AG1 can top off a few vitamin shortfalls and nudge gut bacteria in a positive direction, but it doesn’t tell us much about long-term health outcomes.
What’s Actually Inside
AG1 contains 7.2 billion colony-forming units of two probiotic strains: Lactobacillus acidophilus and Bifidobacterium bifidum. That’s a reasonable count, roughly in line with what you’d find in a standalone probiotic supplement, though dedicated probiotic products often contain more diverse strain profiles.
The formula also includes adaptogenic herbs like ashwagandha and rhodiola. Here’s the problem: AG1 uses proprietary blends, which means you can see the ingredients but not the exact dose of each one. Clinical research on ashwagandha for stress and anxiety typically uses 300 to 600 mg of root extract per day, standardized to a specific concentration of active compounds. Without knowing how much ashwagandha is in a scoop of AG1, it’s impossible to say whether you’re getting an effective dose. The same uncertainty applies to most of the other individual ingredients in the blend.
Fiber content is notably low. At 2 grams per serving, AG1 provides a fraction of the 25 to 38 grams recommended daily. A single medium apple has more fiber. This matters because fiber is one of the main reasons whole fruits and vegetables improve gut health, heart health, and blood sugar regulation. AG1 can’t replicate that benefit.
Safety and Third-Party Testing
AG1 is NSF Certified for Sport, which means a recognized third party verifies that the powder contains what the label claims and tests for unsafe levels of contaminants like heavy metals and microbes. This certification is meaningful. The supplement industry is largely self-regulated, and many greens powders skip independent testing entirely. NSF certification doesn’t guarantee the product works, but it does confirm you’re not ingesting something harmful.
Common Side Effects
The most frequently reported issue is temporary bloating or gas during the first few days. This is a normal response when your gut encounters new fibers, prebiotics, and plant compounds it isn’t used to processing. It typically fades within one to two weeks as your digestive system adapts. Taking AG1 with a light meal rather than on an empty stomach can reduce nausea, gas, or cramping. Drinking it slowly also helps, since gulping a mixed drink quickly increases the amount of air you swallow.
If you have irritable bowel syndrome or particularly sensitive digestion, be cautious. The prebiotic fibers in greens powders feed gut bacteria, which is the goal, but that fermentation process can increase gas production in people who are already prone to bloating. Severe or persistent digestive symptoms lasting more than two to three weeks are worth discussing with a doctor.
How It Compares to Whole Foods
As Stanford Lifestyle Medicine’s nutrition team puts it, even though fruits and vegetables are technically present in many greens powders, once those whole foods lose their original structure, it’s unclear whether the nutrients remain bioavailable after absorption. “There are a lot of claims being made, but almost no data to support them.” Whole foods contain a matrix of fiber, water, and thousands of compounds that work together in ways a dehydrated powder can’t fully replicate.
That said, AG1 isn’t trying to replace food. It’s more accurately compared to a multivitamin, and on that front, it performs reasonably well for filling specific nutrient gaps. If your diet is already rich in colorful vegetables, fruits, legumes, and whole grains, AG1 will have less to offer you. If your diet has real gaps, particularly in vitamins A, C, and E, it may provide a measurable benefit.
What It Costs
A monthly AG1 subscription runs about €87 (roughly $95 USD), which works out to around €2.90 per day. The first month includes a welcome kit with vitamin D3+K2 drops and travel packs, valued at €173. There’s no single-purchase option that avoids the subscription model.
For comparison, a high-quality multivitamin costs $0.30 to $1.00 per day, and a standalone probiotic with more diverse strains runs $0.50 to $1.50 per day. You could buy both for less than half the price of AG1. The premium you’re paying covers the adaptogenic herbs, the greens blend, and the convenience of a single product. Whether that convenience justifies the cost is a personal calculation.
The Bottom Line on AG1
AG1 is a legitimate supplement with third-party safety testing and one published clinical trial showing it can close a small number of nutrient gaps and favorably shift certain gut bacteria. It is not a replacement for eating vegetables. It provides almost no fiber, uses proprietary blends that make it impossible to verify effective doses of individual ingredients, and costs roughly three times what a multivitamin and probiotic would cost separately. For people with a solid diet, it’s an expensive insurance policy. For people with genuine nutritional gaps who won’t fix them through food, it offers some measurable, if modest, benefit.