Key takeaways
• Start with the protein source you tolerate and enjoy: whey, casein, soy, pea, or a well-designed plant blend.• Compare protein per serving, the full ingredient list, and cost per serving – not just the size of the tub.
• A plain formula is often easier to evaluate than one packed with stimulants, greens, enzymes, or vague performance claims.
What we look for
1. Meaningful protein per servingRead the Nutrition Facts or Supplement Facts panel first. The useful comparison is grams of protein in the serving you will actually use, alongside calories, carbohydrate, fat, and added sugar. A scoop size can vary widely across brands.
2. A protein source that suits your needs
Whey is a convenient dairy-based option. Whey isolate is generally lower in lactose than concentrate, while casein digests more slowly. Soy is a complete plant protein; pea and rice blends can improve amino-acid balance for people avoiding dairy. The best choice is the one you can use consistently and digest comfortably.
3. Transparent formula and testing
Look for a complete ingredient list, allergen statement, and clearly stated flavouring or sweetener choices. For competitive athletes, third-party sport certification can be especially valuable because supplements carry a risk of contamination.
4. Cost per usable serving
Calculate cost per serving at the protein dose you need. A low-priced tub can be poor value if the serving is small or mostly filler. Single-serve sachets can be practical for travel but are often more expensive.
What to skip
• Protein blends that hide amounts behind proprietary labels.• Products marketed as a protein powder but built mainly around stimulant or fat-burner claims.
• A formula with ingredients you do not tolerate simply because it has a fashionable label.
The bottom line
The best protein powder is a transparent, good-tasting formula that fits your dietary needs and budget. Use it to make daily protein intake easier; do not let a marketing claim decide the purchase.Key Supplements content is educational and not personal medical advice. Some links on this site may be affiliate links; this never changes our editorial standards or Key Score.