Supplement analysis backed by scientific evidence · PT

← All supplements
Limited evidenceGeneral health

Greens Powder

Greens powders reliably raise blood levels of a few vitamins and carotenoids and can shift oxidative stress markers, but no trial shows they deliver the health outcomes of actually eating fruit and vegetables. They contain almost no fibre and hide their doses in proprietary blends.

What the science says

  • Replaces servings of fruits and vegetables Limited evidence

    A systematic review of 22 clinical interventions with commercial fruit and vegetable concentrates found they consistently raise serum beta-carotene, vitamin C, vitamin E and folate, lower homocysteine, and reduce markers of protein, lipid and DNA oxidation. Effects on inflammation, immunity and endothelial function were described only as promising, and no trial has tested hard clinical endpoints. A scoop delivers a few grams of powder against the roughly 400 g of whole produce it claims to replace, with essentially none of the fibre, water or satiety.

  • Improves cardiovascular and respiratory risk markers Limited evidence

    An encapsulated juice powder concentrate improved markers of pulmonary function and cardiovascular risk factors in heavy smokers, a group with high baseline oxidative stress and poor produce intake. That is exactly the population most likely to respond; it does not establish benefit in people already eating a reasonable diet.

  • Detoxifies or alkalises the body Limited evidence

    There is no evidence behind either claim. Blood pH is held between 7.35 and 7.45 by the lungs and kidneys regardless of diet, and no greens powder trial has measured, let alone demonstrated, removal of any toxin. These are marketing claims, not findings.

  • Delivers clinical doses of its listed ingredients Limited evidence

    Most products list 30-75 ingredients inside proprietary blends, so per-ingredient amounts are undisclosed. When a 10 g scoop contains dozens of botanicals, ingredients with real evidence at 300-600 mg (ashwagandha, beetroot, milk thistle) are almost always present at a small fraction of their studied doses. If you want one of those ingredients, buy it individually at its trial dose.

Dosage & safety

Studied doseTrials generally used 6-9 capsules per day of encapsulated fruit and vegetable juice concentrate, or roughly 8-15 g/day of powder, for 8 to 16 weeks. Commercial scoops are typically 8-12 g once daily. There is no established minimum effective dose for the blend as a whole, and individual ingredients within a proprietary blend are usually well below their own studied amounts.
SafetyGenerally well tolerated; bloating and loose stools are common in the first week. Vitamin K from leafy green components can interfere with warfarin dosing. Kelp, spirulina and seaweed ingredients contribute highly variable iodine, which matters for thyroid disease. Added adaptogens and botanicals bring their own interaction profiles, and some products contain stimulant herbs. Independent testing has found lead and cadmium above proposed limits in some plant-based powders, so choose third-party tested brands. Not a substitute for produce, and not appropriate as the sole source of vitamins in pregnancy.

Scientific references

Where to buy

Greens First, Greens Powder, Mint, 9.97 oz (282.9 g)

View on iHerb

Referral link — this site may earn a commission on purchases.

Related in General health