Isopure Zero Carb Unflavored is my pick for most people: its label prints 0g total carbs and 25g protein per serving, without added flavors or sweeteners. That’s a useful starting point when you want protein without another sweetened drink. If you need a non-dairy option, choose Naked Pea Unflavored, with 2g carbs and 27g protein.
Every pick has at most 3g total carbs per label serving. The table uses total carbs so you can compare them without guessing at missing fiber amounts. For net carbs, subtract fiber, then erythritol, allulose or xylitol only when the label lists them separately. NOW Vanilla lists 1g xylitol; the other picks don’t list any of those deductions from sweeteners. Check the exact flavor and serving weight on your package before buying.
Compare the label servings
| Product | Serving | Total carbs | Protein |
|---|---|---|---|
| Isopure Zero Carb Unflavored | About 1 scoop (29g) | 0g | 25g |
| Dymatize ISO100 Gourmet Chocolate | 1 scoop (32g) | 2g | 25g |
| Optimum Nutrition Gold Standard 100% Isolate Chocolate Bliss | About 1 scoop (31g) | 1g | 25g |
| Transparent Labs Grass-Fed Whey Isolate Unflavored | 1 scoop (33.3g) | 0g | 28g |
| NOW Sports Whey Isolate Creamy Vanilla | 1 level scoop (32g) | 2g | 25g |
| Naked Pea Unflavored | About 2 scoops (30g) | 2g | 27g |
Isopure Zero Carb Unflavored: best overall
The Isopure label lists 25g protein and 0g total carbs per 29g serving, about a scoop. Ingredients are whey protein isolate and sunflower or soy lecithin. The allergen statement declares milk and soy.
There are no added colors, flavors or sweeteners according to the product page. That makes it my straightforward choice for someone who wants to choose their own additions. I’d rather start with a plain powder than commit to a sweetener I don’t want in every shake.
Dymatize ISO100 Gourmet Chocolate: chocolate with stevia and sucralose
The Gourmet Chocolate panel lists 2g total carbs, less than 1g fiber, 0g added sugars and 25g protein per 32g scoop. Total carbs give you the simpler number to budget here.
Hydrolyzed whey protein isolate and whey protein isolate lead the ingredients, followed by cocoa. Sucralose and steviol glycosides supply the sweeteners; milk and soy are declared allergens. Choose it if you want chocolate with that sweetener combination. If a named testing program matters to you, the page’s Banned Substance tested badge doesn’t identify one.
Optimum Nutrition Chocolate Bliss: lowest-carb chocolate
Among these chocolate picks, Gold Standard 100% Isolate Chocolate Bliss has the lower printed total: 1g carbs with 25g protein per 31g serving. Its ingredients include hydrolyzed whey protein isolate, whey protein isolate, cocoa, natural and artificial flavor, lecithin and sucralose. It contains milk and soy.
ON’s India-region support page calls Gold Standard 100% Isolate Informed-Choice Certified and advises checking the certification claims on your package. I’d put this ahead of Dymatize when the lower chocolate carb total is your priority and sucralose suits you.
Transparent Labs Unflavored: NSF Certified for Sport pick
The Unflavored label prints 28g protein per 33.3g scoop. Ingredients are grass-fed whey protein isolate and sunflower lecithin, with milk declared. No sweetener is listed.
Its label lists both 0g total carbs and 1g total sugars, so ask the manufacturer to clarify before relying on it for an exact carb budget.
The NSF Certified for Sport listing specifically names Grass-Fed Whey Protein Isolate Unflavored. That makes it the unsweetened option I’d shortlist when this sport certification is a buying requirement. It also has the largest protein serving in this comparison.
NOW Creamy Vanilla: vanilla with xylitol
NOW’s Creamy Vanilla label lists 25g protein, 2g total carbs, 1g fiber and 1g xylitol per 32g scoop. Subtracting fiber alone gives 1g; also subtracting the separately listed xylitol gives 0g. The 2g total remains the comparison number.
It contains whey protein isolate, natural vanilla flavors, xanthan gum, organic stevia leaf extract and sunflower lecithin, plus xylitol. NOW warns that xylitol is harmful to pets, so keep the powder out of their reach. NOW’s Informed Sport page lists its whey protein isolate under that program.
Naked Pea Unflavored: best non-dairy
The Naked Pea label prints 2g total carbs, 0g fiber and 27g protein per 30g serving, about 2 scoops. Yellow pea protein is the only ingredient. No sweetener needs decoding.
I’d pick this when avoiding dairy matters more than choosing a whey isolate. The serving takes more scoops, but the ingredient list couldn’t be much shorter. Naked Nutrition describes it as NSF contents certified; that is a different program from NSF Certified for Sport.
How to choose
Start with the exact flavor and serving weight. A scoop isn’t a universal measurement: Naked Pea’s serving is about 2 scoops, while the whey picks use about a scoop. Use the gram weight when comparing tubs, especially if you’re changing brands and keeping an old scoop around.
Next, decide whether you want sweetener. Isopure, Transparent Labs Unflavored and Naked Pea list none. The chocolate and vanilla options name theirs above. Don’t choose by the word keto on the front when the ingredients on the back already answer the question.
For certification, match the product and program precisely. If your sport requires a particular program, use that requirement to narrow the list before choosing a flavor. A muscular person on the packaging is not a testing program.
Protein type also matters. Vital Proteins’ own collagen label says collagen is incomplete because it doesn’t provide all essential amino acids. I wouldn’t use a big protein number to gloss over that distinction. Ask your doctor if you need guidance choosing a supplement for a medical diet.
What to avoid
Skip products whose missing carb line forces a guess. Vital Proteins Collagen Peptides and Ancient Nutrition Bone Broth Protein Pure don’t list total carbs on their labels. Neither qualifies here.
Thorne Chocolate prints 4g total carbs, above this guide’s cutoff. Vanilla meets it at 3g but includes 1g added sugar. These are selection reasons, not a verdict that every excluded powder is bad. Buy the label that fits your needs, not the most athletic-looking tub.
