AG1 and Greens Powders: Are They Worth It? (UK 2026)

What do greens powders claim?

AG1 (formerly Athletic Greens) is the best-known greens powder in the UK. It describes itself as "more than a greens powder" and lists more than 75 ingredients: vitamins, minerals, plant powders and extracts, mushrooms, adaptogens (herbs said to help the body cope with stress), digestive enzymes, probiotics and prebiotics. Many cheaper rivals follow the same formula.

The usual claims are that one scoop:

• covers your daily nutrient needs, "so you do not have to worry about your diet"
• supports energy, focus and immunity
• improves gut health and digestion
• replaces a cupboard of separate supplements

Some of these are legally authorised wording. For example, a product that contains enough vitamin C, zinc or selenium can say it "contributes to the normal function of the immune system". That means the nutrient is needed for the immune system, not that the drink boosts it above normal.

What does the evidence show?

Nutrients: you get what is on the label

A greens powder is, at heart, a multivitamin in drink form. If your diet is genuinely poor, it will raise your intake of vitamins and minerals. The NHS says most people should get all the nutrients they need from a varied, balanced diet, with some groups (for example, people needing vitamin D in autumn and winter) benefiting from specific supplements.

Gut health: one small, company-funded trial

The main published AG1 trial on the gut is a 2024 randomised trial of 30 healthy adults over four weeks. AG1 increased two probiotic bacteria (most likely the same species that are in the product) and digestive quality-of-life scores showed a trend that did not reach statistical significance. Two authors were AG1 employees. This is a reasonable first study, but it does not show meaningful health benefits.

Long-term health: multivitamins have not delivered

Because greens powders are mainly multivitamins, the large studies on multivitamins are relevant. A 2024 analysis of 390,000 US adults followed for about 20 years found multivitamin users did not live longer. The US Preventive Services Task Force review found insufficient evidence that vitamin and mineral supplements reduce heart disease or cancer in the general population.

Vegetables are not just nutrients

Whole vegetables bring fibre, water, texture and a mix of plant compounds that are diluted or lost when dried and powdered. A scoop of powder typically contains only a few grams of plant material. Five portions of fruit and vegetables a day is still the advice, and a powder does not count towards it in any meaningful way.

Proprietary blends hide the doses

Many greens powders list some ingredients only as part of a named "blend" with a single total weight. That is legal, but it means you cannot tell whether you are getting a useful amount of, say, ashwagandha or a probiotic strain, or just a sprinkle for the label. If an ingredient matters to you, choose a product that states its exact dose.

Cost

A UK review in February 2026 put AG1 at about £2.63 a serving on subscription and £3.57 for a one-off pouch, roughly £80 to £100 a month. A supermarket multivitamin or a vitamin D tablet costs a few pence a day. A bag of frozen spinach and frozen berries costs less than one serving of most premium powders.

Who might reasonably try one?

• People with a genuinely limited diet (very busy, poor appetite, or few vegetables) who find a drink easier than tablets.
• People who would otherwise take several separate supplements and value the convenience.
• Athletes who need a product with third-party sports testing.

Who should be careful?

• Pregnant or trying to conceive: check the vitamin A content and the herbal ingredients with your midwife or GP. In pregnancy you need 400 micrograms of folic acid daily, which a pregnancy-specific supplement covers more reliably.
• People on warfarin: greens powders can contain vitamin K, which affects how warfarin works. Speak to your anticoagulation clinic or pharmacist.
• People on other medicines: adaptogens and herbal extracts can interact with medicines, including thyroid, diabetes and blood pressure drugs. Ask a pharmacist.
• Anyone already taking a multivitamin, vitamin D or iron: stacking products can push some nutrients towards NHS upper limits.
• Children: these are formulated for adults.

If you want to try one: what to look for

• Third-party testing: NSF Certified for Sport, Informed Sport or Informed Choice. AG1 states it holds NSF Certified for Sport; check the current NSF listing for any product you buy.
• Fully disclosed doses: avoid products where key ingredients are hidden inside a proprietary blend.
• Sensible nutrient levels: avoid products that supply many times the daily reference intake of vitamins.
• No disease claims: claims that a powder "detoxes", "alkalises" or treats a condition are not allowed under UK law and are a red flag.
• Price per serving: compare honestly with a basic multivitamin plus more vegetables.

A cheaper way to cover the gaps

If the appeal of a greens powder is peace of mind, these targeted, NHS-backed steps cover the common gaps for much less money:

• Vitamin D: the NHS advises everyone to consider 10 micrograms a day in autumn and winter, and all year for people who get little sun.
• Folic acid: 400 micrograms a day if you could become pregnant or are in early pregnancy.
• Vitamin B12: important if you eat a vegan diet, via fortified foods or a supplement.
• More plants: frozen vegetables, tinned beans and frozen berries are inexpensive and count towards your five a day.

Bottom line

AG1 and other greens powders are convenient multivitamins with extras. They are reasonable for some people with patchy diets who can afford them, but the evidence for benefits beyond basic nutrition is limited and largely company-funded. If budget matters, a vitamin D supplement in winter plus frozen vegetables is the better value swap.