Best greens powder NZ: Ghost vs OxyGreens vs Gaspari

You are standing in the kitchen at 7am, you know you ate almost no vegetables yesterday, and a tub of green powder is sitting there promising to fix it. It will not fix it. What it can do is add a small amount of plant material to a day that had none, taste alright, and be easy enough that you actually do it.

That is the honest pitch. Here is how the three greens powders we stock compare once you look at the numbers instead of the marketing.

The short answer

• Cheapest per serve is Gaspari Proven Greens & Reds at $49.45 for 30 serves, which is $1.65 a serve. It also has the best rating of the three at 4.91 from 116 reviews.
• EHPlabs OxyGreens is $56.35 for 30 serves, or $1.88 a serve, and it carries by far the most reviews at 1,116 with a 4.67 rating. Only two flavours are in stock right now.
• Ghost Greens is $69.85 for 30 serves, or $2.33 a serve, the dearest of the three.
• Does Ghost Greens have caffeine? No caffeine is listed for it in our product data. Same for OxyGreens and the Gaspari. If you want a green drink that wakes you up, greens powder is the wrong aisle. (none listed on the label data we hold)

What a greens powder actually is

Strip the branding off and a greens powder is dried plant material, usually spirulina, chlorella, wheatgrass, kale and some fruit extracts, ground up and flavoured so it goes down. Most add vitamins and minerals. Some add probiotics or digestive enzymes.

A serve is small. Ghost Greens is 11 g, Gaspari is 12 g, OxyGreens is 7.7 g. That is one to two heaped teaspoons of dried powder, which is why nobody sensible calls this a vegetable replacement.

What it can reasonably do, and what it cannot

Here is what I am comfortable saying. A greens powder is a convenient way to get some plant compounds into a day that would otherwise have none, it tastes better than most people expect, and it is easy to keep up. Those are real, modest wins.

Here is what I am not comfortable saying. The words "detox", "alkalise" and "all-day energy" do a lot of work on greens tubs and very little of it is backed. If a tub has no caffeine in it, and none of these three list any, then whatever lift you feel is not coming from a stimulant.

The individual ingredients have been studied more than the blends have. Examine's page on spirulina walks through what the human research supports and how thin some of it is. Nobody has run a decent trial on the specific mix inside these tubs, so treat any claim about the finished product as marketing, not a finding.

What to look at on the label

Serving size first. A 7.7 g serve and a 12 g serve are not the same product at the same price, even if both say "30 serves" on the front.

Then look for a proprietary blend. If the label lists "Greens Blend 5,000 mg" and names fifteen ingredients underneath without individual amounts, you have no idea how much of each you are getting. It could be mostly cheap filler with a dusting of the interesting stuff. Gaspari lists 5,000 mg of greens per serve and Ghost lists 4,340 mg, which tells you the size of the blend but not what is inside it.

Added vitamins are fine but rarely the reason to buy. If you are chasing vitamin D, a dedicated dose is cheaper and you know exactly what you are taking. Same with probiotics: a count on the front of a tub tells you nothing unless the strains and CFU are named.

The comparison table

Prices as at 2 September 2026. Price per serve is price divided by serves.

All three are vegan and gluten free by their product tags. OxyGreens also comes in Guava Paradise, Pineapple, Passion Fruit, Proton Plasma and Slimer, all currently out of stock. Its 1,116 reviews and 4.67 rating are shared across the flavour family, not one flavour.

The price per serve conversation nobody has

At $1.65 to $2.33 a serve, a daily greens habit costs between $50 and $70 a month. A bag of baby spinach, a bag of frozen mixed veg and a few carrots cost less than that for a week, and they bring fibre, water and bulk that a teaspoon of powder does not.

So say it plainly: if you can eat vegetables, eat vegetables. Greens powder is what you buy when the honest answer is that you will not. That is not a reason to never buy one, but be clear you are paying for convenience and taste, not nutrition you cannot get cheaper.

Who a greens powder actually suits

Two people, mostly.

The person who genuinely does not eat vegetables. Not "eats fewer than ideal", but goes days without any. For them a tub is a floor, not a ceiling, and a floor is worth having.

The traveller and the shift worker. Airports, motels, night shifts, a work ute full of servo food. A scoop in a shaker travels and a bag of silverbeet does not.

Who it does not suit: anyone hoping it replaces a meal, anyone expecting a lift in the gym, and anyone on a tight budget who could put that $60 a month into food or into something with clearer evidence behind it, like creatine or protein.

A sensible way to use one

Take it whenever you will actually remember. There is no magic window. Morning works for most people because the tub sits next to the kettle.

Mix it in cold water with a proper shaker, not a spoon in a glass, because greens powders clump. Two hundred and fifty to 400 ml is about right. Less water and most of them taste like a lawn.

Do not stack it with a second multivitamin without reading both labels. Overlapping vitamin doses are the most common mistake here, especially with fat soluble vitamins.

If your actual goal is sleep, recovery or gut health, buy the thing that targets it. We have written separately on magnesium and sleep, on magnesium for training, on probiotics for athletes and on how much vitamin D makes sense.

Where NZ Supps fits

We are based in New Zealand, so you are not waiting on an overseas parcel or paying at the border. Orders placed before 1pm on a working day dispatch the same day, and shipping is free over $99.

We stock three greens powders and I have just told you which is cheapest per serve and which has the most reviews behind it. Browse the greens and vitamins range, or if you are not sure a greens powder is even the right buy, run through find your stack and see what comes out.

Does Ghost Greens have caffeine?

No caffeine is listed for Ghost Greens in our product data, and the same goes for OxyGreens and Gaspari Proven Greens & Reds. None of the three are stimulant products. If you want caffeine, that is a pre workout or an energy drink, not a greens tub. (none listed on the label data we hold)

Which greens powder is the best value in NZ?

On price per serve, Gaspari Proven Greens & Reds at $1.65 a serve. OxyGreens is $1.88 and Ghost Greens is $2.33. All three are sold as 30 serve tubs, so the comparison is clean.

Do greens powders replace vegetables?

No. A serve is 7.7 g to 12 g of dried powder, which is a fraction of the volume and fibre of actual vegetables. Treat one as a top up on a bad week, not a swap for the produce aisle.

How many calories are in a greens powder?

Very few. Gaspari lists 10 calories per serve, OxyGreens 20, and Ghost Greens 30. None of them will meaningfully affect your daily intake.

Will a greens powder give me more energy?

Not directly, since none of these contain a stimulant. If you feel better on one, it is more likely down to hydration, routine, or filling a gap in a diet that was short on something. That is a real effect but it is not the powder doing something special.

Do I need one if I already take a multivitamin?

Probably not both. Read the two labels side by side before you double up, because the vitamin doses often overlap. Pick the one you will take consistently and stop there. Sources: Examine.com spirulina page (https://examine.com/supplements/spirulina/); EFSA scientific opinion on caffeine (https://www.efsa.europa.eu/en/efsajournal/pub/4102). Product prices, serves, calories and review counts from the NZ Supps catalogue, as at 2 September 2026.