Amazing Grass greens powders offer some nutritional value, but they come with real caveats that are worth understanding before you buy. The products contain a blend of wheatgrass, barley grass, spirulina, chlorella, and other plant-based ingredients that do provide vitamins and antioxidants. However, the brand has faced legal action over heavy metal contamination, and no greens powder truly replaces eating whole vegetables.
What’s Actually in It
Amazing Grass products center on dried grasses and algae. Barley grass, one of the core ingredients, is a solid source of vitamins A, C, and K, along with polyphenols and flavonoids that act as antioxidants. Dried barley grass also delivers about 3 grams of fiber per tablespoon. Some formulations include spirulina, chlorella, beet root powder, and digestive support ingredients like prebiotics and probiotics, though the brand doesn’t publicly disclose specific probiotic strains or colony counts on most products.
The “Energy” versions contain yerba mate leaf extract and matcha green tea, both natural sources of caffeine. The energy blend totals about 897 mg of combined plant extracts per serving, but the actual caffeine content in milligrams isn’t listed on the label, which makes it hard to know exactly how much stimulant you’re getting.
The Lead and Cadmium Problem
In a development many consumers aren’t aware of, the California Attorney General’s office reached a $213,167 settlement with Amazing Grass (operating as Grass Advantage) over products that contained excessive levels of lead or cadmium, violating California’s Proposition 65 law. The settlement covered 13 products, including several Green Superfood varieties, the Organic Wheat Grass powder, and multiple Amazing Meal products.
As part of the settlement, Amazing Grass was required to hire a food quality auditor to recommend measures for reducing lead levels, identify low-lead ingredient sources, and routinely test covered products. The company also had to provide warning labels for any products exceeding Proposition 65 thresholds. This is a real concern with greens powders broadly, not just Amazing Grass. Plants like grasses and algae can absorb heavy metals from the soil and water where they’re grown, and concentrated powders can amplify those trace amounts.
Greens Powder vs. Whole Vegetables
The most important thing to understand about any greens powder is what gets lost in processing. Most powdered greens deliver only 1 to 2 grams of fiber per serving, according to Mayo Clinic Press. Compare that to a cup of cooked broccoli (about 5 grams of fiber) or a cup of cooked spinach (about 4 grams). Fiber is one of the biggest reasons vegetables are good for you in the first place: it feeds beneficial gut bacteria, supports healthy blood sugar, and keeps digestion moving. A greens powder strips most of that away.
You also lose the water content, the physical bulk that helps you feel full, and the natural food matrix that helps your body absorb certain nutrients. Whole vegetables like kale, spinach, and broccoli score high in antioxidant capacity on their own. Kale scores around 1,770 ORAC units per 100 grams, spinach around 1,260, and broccoli around 890. You don’t need a powder to get those benefits.
The “Alkalizing” Claim Doesn’t Hold Up
Amazing Grass markets some products with language about alkalizing or detoxifying your body. This is not supported by clinical evidence. Your blood maintains a very narrow pH range of 7.35 to 7.45, and your lungs and kidneys constantly filter your blood to keep it there. Food cannot meaningfully shift your blood pH. When your body processes food, any acidic or alkaline byproducts are rapidly filtered out and excreted in urine, saliva, and sweat. If your blood pH actually moved outside that tight range, you’d be critically ill. The alkalizing angle is marketing, not science.
Digestive Side Effects to Expect
If you do try Amazing Grass, your gut may need an adjustment period. Gas and mild bloating during the first few days are common. Several ingredients can make this worse for people with sensitive digestion or IBS. Prebiotic fibers like inulin nourish gut bacteria but also increase gas production, especially in larger amounts or on an empty stomach. Some greens powders also contain sugar alcohols (sorbitol, xylitol, erythritol) that are poorly absorbed and can ferment in the gut, causing gas or diarrhea.
Mixing your powder slowly and drinking it at a moderate pace can help. Gulping it down quickly increases the amount of air you swallow, which adds to bloating and abdominal discomfort. Starting with a half serving and building up over a week gives your digestive system time to adjust.
Who Might Benefit
Amazing Grass is not harmful for most people in the short term, and it can serve a narrow purpose. If you travel frequently, have stretches where fresh vegetables are genuinely unavailable, or struggle to eat any produce at all, a greens powder provides some of the vitamins and antioxidants you’d otherwise miss entirely. It’s better than nothing.
But it’s not a substitute for actual vegetables, and the brand’s history with heavy metal contamination means you should pay attention to third-party testing and Proposition 65 warnings on the label. If you’re eating a few servings of whole vegetables most days, a greens powder adds very little that your diet isn’t already covering. The fiber alone makes whole food the clear winner. For anyone on blood-thinning medication, the vitamin K content in greens powders (from ingredients like barley grass and spinach) is worth discussing with your prescribing doctor, since vitamin K directly affects how those medications work.