10 Best Muscle Building Supplements 2026 in the United States

Optimum Nutrition Micronized Creatine Monohydrate Capsules offer a convenient way to supplement creatine, which is well-regarded for supporting muscle size, strength, and performance especially when paired with intense workouts. Each serving provides 2.5 grams of pure creatine monohydrate, a trusted ingredient known to enhance muscle energy production and power output. Since the product comes in unflavored capsules, it eliminates the hassle of mixing powders and avoids taste issues or clumping. It contains zero calories and carbohydrates, making it suitable for those on keto diets or anyone mindful of calorie intake.

This supplement does not provide protein, amino acids, or added nutrients commonly found in protein powders, so it should be used alongside a protein-rich diet or other supplements for complete muscle-building nutrition. The capsules are also free from banned substances and manufactured under strict quality controls, which adds peace of mind for athletes. For those seeking a simple, no-fuss creatine supplement to boost strength and muscle performance, this product fits well. However, if a supplement that also delivers protein and amino acids is desired, combining it with other products is necessary.

Nutricost Creatine Monohydrate Powder in Pineapple Mango flavor is a muscle-building supplement that offers a tasty way to incorporate creatine into your routine. With 5 grams of micronized creatine monohydrate per serving, it mixes easily and absorbs well in your system. This product is vegan, non-GMO, and gluten-free, making it a suitable option for those with dietary restrictions.

The 500-gram bottle provides 77 servings, ensuring good value for your money and a steady supply to support your fitness goals over time. The product is manufactured in an NSF certified and GMP compliant facility and undergoes independent testing, which helps assure you of its quality and purity.

If you're looking for a supplement with additional ingredients like amino acids or protein, you might need to consider other products since this creatine powder focuses solely on delivering creatine monohydrate. While the Pineapple Mango flavor is a unique selling point, flavor preferences can be quite subjective, and some users might not enjoy it. This product is a great choice for those who want a reliable and effective creatine supplement with a pleasant taste and excellent quality control.

Optimum Nutrition Gold Standard 100% Whey Protein Powder is a solid choice for anyone aiming to build or maintain muscle. Each serving offers 24 grams of protein, which supports muscle growth when combined with regular exercise. It uses whey protein, which is quickly absorbed and rich in essential amino acids, including 5.5 grams of branched-chain amino acids (BCAAs) that are important for muscle recovery. This helps your muscles repair and grow after workouts. The calorie content is moderate, making it suitable for those who want muscle gain without excessive extra calories. The product is gluten-free and tested for banned substances, which adds to its reliability and safety.

The Double Rich Chocolate flavor is popular and generally mixes well in water or milk, making it convenient and tasty to consume. A minor downside is that the packaging may vary and the product is marked as discontinued by the manufacturer, which might affect availability. Optimum Nutrition's reputation as a leading sports nutrition brand provides confidence in its quality. This whey protein powder is best suited for individuals looking for a trusted, effective supplement to support muscle building and recovery with a good balance of taste and nutrition.