Best Protein Water NZ: Powders, Cans and Cost Per Serve

It is 28 degrees, you have just finished a run, and the thought of a thick chocolate shake makes you feel slightly ill. That is the exact moment protein water sells itself. The honest answer is that protein water is real protein and it works fine, but you pay a premium for the texture, and the cans cost roughly four times what a tub does per gram.

The short answer

• Protein water is either clear whey isolate or hydrolysed collagen peptides mixed thin, so it drinks like cordial instead of milk. Check which one you are buying: whey is a complete protein, collagen is not.
• Cheapest way to drink it in NZ right now is powder. Nexus Super Protein is $74.85 for 30 serves, which is $2.50 a serve at 90 calories (83 in Tasteless and Ice Cola).
• Inspired Protein Water is $78.45 for 25 serves, so $3.14 a serve, with 24.3 g protein and 104 calories.
• Cans are the convenience tax. A single Nexus Super Protein Sparkling Water is $6.79 for 16.9 g protein. The 12-pack drops it to $5.83 a can.
• If cost per gram of protein is your only concern, a plain whey tub beats all of it. MusclePharm Combat 100% Whey works out at $2.19 for 25 g.

What protein water actually is

Take whey protein isolate, strip out nearly all the fat and lactose, then flavour it like a fruit drink instead of a milkshake. That is the whole trick. Because there is almost no fat and very little carbohydrate left, it does not go cloudy or thick in water.

Some products go further and use hydrolysed whey, where the protein has been partly broken down before it reaches you. That improves clarity and mixing speed. It does not make the protein work better in your body, whatever the label suggests. We covered that chemistry in our guide to clear whey protein.

When protein water beats a milky shake

Heat is the big one. In February, a shaker of whey concentrate that has been sitting in a hot car is genuinely unpleasant. A clear protein does not curdle the same way and it does not smell.

Post-cardio is the second case. After a long run, most people want fluid before food. A 500 ml bottle of something fruity that happens to contain 20 to 25 g of protein solves both at once.

The third group is people who simply dislike thick shakes. That is a valid reason. Protein you actually finish beats protein sitting in the cupboard.

Where it loses is meal replacement. A milky shake with 30 g protein and some fat and carbs sits heavier and holds you longer. If you are using protein to blunt hunger, read our take on protein for a cutting phase first.

Whey or collagen? Read the label before you buy

Two different proteins hide behind the words protein water, and they are not interchangeable. Ghost Clear Whey Isolate is whey, so every scoop carries the full amino acid profile your muscles need, including the leucine that switches on muscle protein synthesis. Nexus Super Protein and the Nexus Sparkling Water cans are hydrolysed collagen peptides. Collagen is very low in leucine and has almost no tryptophan, so it does not count the same way toward the 1.6 to 2.2 g per kg target for building muscle. Inspired Protein Water sits in between, blending whey isolate with collagen peptides for its 24.3 g.

That does not make collagen a bad product. It is dairy free, it mixes crystal clear, and it is a pleasant way to add protein to a day that is already covered by meals. It just should not be the protein you rely on to hit your daily number if muscle is the goal. If it is, pick the whey version, or use collagen alongside a whey or plant shake rather than instead of one.

Powders, cans and RTDs compared

Prices as at 2 September 2026. Price per serve is the pack price divided by the serve count.

The last two rows are not protein water. They are there because people shopping for protein water often end up buying one of them instead, and it is worth seeing the price gap honestly.

Does the protein type actually matter?

Not much, once you clear a low bar. Morton and colleagues pooled 49 trials in the British Journal of Sports Medicine and found protein supplements produced real gains in strength and lean mass alongside resistance training, with total daily intake mattering far more than the source.

The ISSN position stand on protein and exercise lands in the same place: roughly 1.4 to 2.0 g of protein per kg of bodyweight per day, spread across the day. Nothing in either paper says isolate beats concentrate, or clear beats creamy.

So the choice here is texture, heat and price, not results. If a clear protein is what gets you to your daily number, that is the correct product for you.

Working the numbers for a real week

Say you weigh 75 kg and you are aiming at the middle of that ISSN range, so about 130 g of protein a day. Food gets you most of the way. One drink covers the last 20 to 25 g.

Powder route: Nexus Super Protein at $2.50 a serve, five training days a week, is $12.50. Over a month that is about $54.

Can route: five Nexus Sparkling Waters a week from a 12-pack at $5.83 each is $29.15 a week, or roughly $126 a month. You are paying about $72 more each month for not having to wash a shaker.

The sensible middle is what most of our regulars do. Buy a tub for home and gym days, keep a few cans in the fridge for the days you are out. Nobody needs to pick a side.

On sugar, the good news is that these are not sugary drinks. The Nexus cans list zero sugar, and Inspired Protein Water carries 1 g per serve. Both use non-nutritive sweeteners, which is why a 69 calorie can can taste like lemonade. If sweetener aftertaste bothers you, Nexus makes a Tasteless version at 83 calories that you can put through juice or plain water.

Where NZ Supps fits

We are based in New Zealand, we dispatch same day on orders placed before 1pm, and shipping is free over $99. That last number matters here, because a single 12-pack of cans at $70.00 does not clear it but a tub plus a 12-pack does.

If you want thin and fruity, start in protein water. If you want the cheapest gram of protein and do not mind a shake, look at whey protein instead. Not sure which fits your training, use find your stack and pick the goal that matches. We would rather sell you the $2.19 tub that suits you than the $6.79 can that does not.

Is protein water the same as protein powder?

It is protein powder, just a different type mixed thinner. Protein water uses either whey isolate with the fat and lactose stripped out, or hydrolysed collagen peptides, so it dissolves clear. Standard powder usually uses concentrate, which stays milky.

How much protein is in protein water?

It depends on the product. Nexus Super Protein Sparkling Water has 16.9 g per can, Inspired Protein Water has 24.3 g per serve, and Ghost Clear Whey Isolate has 25 g. Anything under about 15 g per serve is a hydration drink with protein added, not a protein drink.

Is protein sparkling water worth the price?

Only for convenience. At $5.83 a can in a 12-pack for 16.9 g of protein, you are paying roughly four times what the same protein costs from a tub. Buy them for the car and the office, not as your main source.

Can you drink protein water on a cut?

Yes, and it is one of the better options for it. The cans are 69 calories and the powders sit at 90 to 104, against 173 for a milky bottled shake. Just know that thin drinks tend to satisfy hunger less than thick ones.

Does protein water actually build muscle?

It contributes the same as any other whey protein, which the research says helps when your total daily intake is adequate and you are training. The form of the drink is not what drives the result. Our guide on how much protein per day covers the target.

Should I buy powder or ready-to-drink cans?

Powder if you drink it at home or at the gym, cans if you are out and will not have a shaker. Ready-made bottled shakes are a third option again, heavier and higher in calories, which we compared in RTD protein versus powder. Sources: Morton et al. 2018, British Journal of Sports Medicine (https://bjsm.bmj.com/content/52/6/376); Jäger et al. 2017, ISSN Position Stand: Protein and Exercise, Journal of the International Society of Sports Nutrition (https://jissn.biomedcentral.com/articles/10.1186/s12970-017-0177-8). Prices and stock as at 2 September 2026.