Best Protein Powder for the Money 2026: Cost per 25 g of Protein
The best protein powder for the money is Optimum Nutrition Gold Standard: $1.49 per 25 g of protein on Amazon. Naked Pea, a plant protein with no flavor, costs less tonight, at $0.71. The 20 tested powders below cost $0.71 to $4.03 per 25 g.
By Erin Rose Updated October 20, 2026 How we score
Why we pick it · Protein guide
What 25 g of protein costs in every tested powder
| Powder, scoop and tub | Per 25 g | A month |
|---|---|---|
| Naked Pea 27 g of protein in a 30 g serving · 5 lb, 76 servings, $57.99 · plant protein Informed Choice | $0.71 | $21 |
| MusclePharm Combat 25 g of protein a serving · 4.2 lb, 52 servings, $69.99 Informed Sport | $1.35 | $40 |
| Muscle Milk Genuine 32 g of protein in a 70 g serving · 1.93 lb, 13 servings, $23.18 NSF Certified for Sport | $1.39 | $42 |
| Optimum Nutrition Gold Standard 24 g of protein in a 30.4 g serving · 5 lb, 74 servings, $105.99 Informed Choice | $1.49 | $45 |
| BulkSupplements Whey Protein Isolate 25 g of protein in a 30 g serving · 33 servings, $56.97 NSF Certified for Sport | $1.73 | $52 |
| Garden of Life Sport Plant Protein 30 g of protein in a 45 g serving · 19 servings, $41.59 · plant protein Informed Choice | $1.82 | $55 |
| Naked Whey 25 g of protein in a 30 g serving · 5 lb, 76 servings, $139.99 Informed Choice | $1.84 | $55 |
| Garden of Life Raw Organic Protein 22 g of protein in a 33 g serving · 20 servings, $32.49 · plant protein Informed Choice | $1.85 | $55 |
| Vega Performance Protein 30 g of protein in a 41 g serving · 1.83 lb, 20 servings, $44.99 · plant protein NSF Certified for Sport, Informed Choice, NSF/ANSI 173 | $1.87 | $56 |
| Optimum Nutrition Gold Standard Isolate 25 g of protein in a 31 g serving · 3 lb, 44 servings, $89.99 Informed Choice | $2.05 | $61 |
| Ascent 100% Whey (2 lb) 25 g of protein in a 31 g serving · 2 lb, 29 servings, $59.94 Informed Sport | $2.07 | $62 |
| Isopure Low Carb 25 g of protein in a 34 g serving · 4.5 lb, 62 servings, $128.24 Informed Choice | $2.07 | $62 |
| Kaged Whey Isolate 25 g of protein in a 33 g serving · 3 lb, 41 servings, $84.99 Informed Sport | $2.07 | $62 |
| Dymatize ISO100 25 g of protein in a 30 g serving · 1.3 lb, 20 servings, $42.48 Informed Choice | $2.12 | $64 |
| Garden of Life Sport Whey 24 g of protein in a 33 g serving · 20 servings, $41.99 NSF Certified for Sport, Informed Choice | $2.19 | $66 |
| Legion Whey+ 22 g of protein in a 27.2 g serving · 30 servings, $59.50 NSF/ANSI 173 | $2.25 | $68 |
| Thorne Whey Protein Isolate 21 g of protein in a 27.9 g serving · 30 servings, $65.00 NSF Certified for Sport, NSF/ANSI 173 | $2.58 | $77 |
| Bare Performance Nutrition Whey Isolate 25 g of protein in a 31.6 g serving · 25 servings, $64.99 NSF Certified for Sport | $2.60 | $78 |
| Dymatize Elite Whey 25 g of protein in a 36 g serving · 2 lb, 25 servings, $67.94 Informed Choice | $2.72 | $82 |
| Klean Isolate 20 g of protein in a 25.8 g serving · 20 servings, $64.50 NSF Certified for Sport, NSF/ANSI 173 | $4.03 | $121 |
We checked 5 testing lists for all 20 powders in this table; USP Verified lists none of them. A month is 25 g of protein a day for 30 days. The lists: Informed Sport tests every batch before sale. NSF Certified for Sport names the lots it tested. Informed Choice tests store-bought samples. NSF/ANSI 173 checks the label and sets limits for metals.
Also on a testing list: Myprotein Impact Whey Isolate (Informed Choice), Transparent Labs Whey Isolate (NSF Certified for Sport, Informed Choice) and NOW Sports Whey Isolate (Informed Sport).
We also price powders that are on no testing list we searched: GHOST Whey Protein, Premier Protein 100% Whey Powder, Nutricost Whey Protein Isolate, Cellucor C4 Whey, Orgain Organic Protein Plant-Based and Isopure Zero Carb Whey Isolate. They are left out of this table.
Buy the biggest tub you will finish
Tub size moves the price more than brand. Gold Standard costs $1.49 per 25 g in the 5 lb tub and $1.77 in the 2 lb tub, about 18% more for the same powder.
Amazon prices move from week to week, and the cheapest tub can change. This table updates each night; check the price on the day you buy. To check any tub yourself: divide its price by its scoops, then by the grams of protein a scoop, and multiply by 25.
Our pick for each need
- Most people: Naked Whey, $1.84 per 25 g, with one ingredient and no sweetener. The best protein powder has picks for isolate and other needs.
- Plant protein: Vega Performance Protein, $1.87 per 25 g, the only plant powder here on NSF/ANSI 173, which sets limits for lead. Plant powders carry more lead than whey; see is protein powder safe.
- Drug-tested for sport: BulkSupplements Whey Protein Isolate, $1.73 per 25 g, on NSF Certified for Sport.
Which tubs and flavors each list covers: third-party tested protein powder. Powder is a convenient option, not a requirement: food can cover your protein (how much you need).
Sources
- Prices: Amazon, checked each night; last check November 6, 2026.
- Protein and scoop size: each product’s label, checked against the Amazon listing we link to.
- Testing lists, searched October 3, 2026: Informed Choice, Informed Sport, NSF Certified for Sport and NSF/ANSI 173.
The unit is 25 g of protein, inside the 20 to 40 g per meal that sports-nutrition research uses (dosage guide).