Every part of your body contains protein, from your skin and hair to your muscles. Not only does protein supply your body with energy, it helps regulate and repair your cells. While most American adults with well-balanced diets consume a sufficient amount of protein, those who are looking to increase their muscle mass and strength may need protein supplements.

Are You Getting Enough Protein in Your Diet?

But what constitutes a sufficient amount of protein may vary from person to person depending on his or her age, sex, weight, and activity level. The Recommended Dietary Allowance (RDA) is roughly 0.4 grams (g) of protein per pound, says Leslie J. Bonci, RDN, owner of Active Eating Advice, a nutrition consulting company in Pittsburgh, Pennsylvania. Endurance athletes or those with active lifestyles will need 0.5 to 0.6 g of protein per pound, while those looking to increase their muscle mass may need up to 0.5 or 0.8 g of protein per pound. In general, the average recommended amount of protein for a sedentary man is 56 g per day, while the recommended amount for a sedentary woman is 46 g per day. To help you determine your RDA for protein, you can use this online protein calculator or, even better, consult your primary care doctor or a registered dietitian nutritionist. When looking for the right protein powder for your body, pay special attention to the amount of protein per serving. Bonci recommends tracking your daily protein intake. “It’s important to remember that whole foods contain protein and there is no need to exceed daily requirements,” says Bonci. “Look for a protein powder that has around 20 to 25 grams of protein per serving, and factor that protein into your total protein intake for the day.” Also, pay special attention to whether the product has complete or incomplete protein, as incomplete protein may need to be combined or supplemented. Protein is considered complete when it contains all the essential amino acids, according to the Food and Drug Administration (FDA). Animal products like poultry, fish, beef, pork, eggs and dairy are all considered complete protein sources. Most vegetables, nuts, seeds, and beans are considered incomplete protein sources and must be combined to become complete. For example, beans on their own are not considered a complete protein, but when they’re combined with rice, they becomes complete.

A Word of Caution About the Risks of Using Protein Powder

Be sure to keep in mind the FDA doesn’t regulate protein powders. To ensure you’re picking a responsible protein powder, Bonci recommends looking for a third-party certification, such as NSF Certified for Sport, on the label. If a product doesn’t have a seal, look at the ingredients to make sure you’re not consuming more than your RDA for protein. Too much protein can put a strain on your organs and lead to excessive weight gain over time. You can also use this list as a starting point! From whey protein powder to a 100 percent organic plant-based option — these are our top six picks for the best protein powders.

Optimum Nutrition Gold Standard Whey Protein Powder

Bulksupplements Pure Casein Protein Powder

ALOHA Organic Plant Based Protein Powder

NOW Foods Soy Protein

Naked Pea

Manitoba Harvest HempPro 70