Protein Powders Guide: Types, Reviews & Best Picks

What Protein Powder Is

Protein powder is protein extracted from food, most often milk (whey and casein) or plants like peas, rice, and soy, then dried into a powder. It isn't a special muscle-building ingredient; it's the same protein you'd get from food, in a form that's quick to mix and easy to measure.

That makes it a tool for filling a gap. If your meals already provide enough protein, you won't gain much from adding a shake. If you regularly fall short, a scoop or two a day is one of the simplest fixes in nutrition.

How Much Protein You Need

The International Society of Sports Nutrition recommends 1.4–2.0 g of protein per kg of body weight per day for people who exercise, spread across meals of roughly 20–40 g. For a 180 lb (82 kg) person, that's about 115–165 g a day. Older adults and people cutting calories tend to do better toward the top of that range.

Work out your own number, and how much of it food already covers, with our guide to how much protein you need per day.

Whey or Plant-Based?

Whey digests quickly, is rich in leucine (the amino acid that switches on muscle building), and tastes good in water. Isolate is the version to choose if regular whey upsets your stomach.

Plant blends have closed most of the gap. Combining pea and rice gives a complete amino acid profile, and a slightly bigger scoop makes up the small difference in leucine. Choose plant protein if you're vegan, dairy-free, or simply prefer it. Compare them in detail in plant protein vs whey.

Collagen powders are sold alongside protein, but collagen is missing an essential amino acid and isn't a substitute for a regular protein powder when it comes to muscle.

How to Use It

• Use it to fill gaps, not to replace meals every day.
• One scoop of 20–40 g protein per serving is plenty; more at once isn't more effective.
• Timing is flexible. After training, at breakfast, or as a snack all work; total daily intake matters most.
• Mix it into food, like oatmeal, yogurt, or smoothies, if shakes get boring.

Safety and Side Effects

For healthy people, protein powder is safe at normal servings. The most common issues are digestive: bloating or gas, usually from lactose in whey concentrate or from sweeteners and gums. Switching to whey isolate or a plant protein usually fixes it.

The bigger concern is quality. Supplements aren't approved by the FDA before they're sold, and independent testing has found contaminants like heavy metals in some products. Choosing a brand with third-party testing is the simplest protection. Read more in is protein powder safe?

Our Top Picks

We rate protein powders on protein per scoop, ingredients, testing, taste, and value. See the full list in the cleanest protein powders, or the brand-vs-brand reviews above.