Algae, particularly species like Spirulina and Chlorella, have gained popularity among bodybuilders as dietary supplements due to their high protein content and nutritional density. Scientific evidence supporting their use in bodybuilding is modest but growing. Algae are rich in complete proteins, essential amino acids, vitamins (such as B12 in some species), minerals (like iron and magnesium), and antioxidants. These nutrients are beneficial for muscle repair, recovery, and overall health—key factors in successful bodybuilding.

Several small-scale studies suggest that spirulina supplementation may help reduce exercise-induced oxidative stress and improve endurance and muscle strength, likely due to its antioxidant and anti-inflammatory properties. For example, a randomized controlled trial published in the European Journal of Applied Physiology (2010) found that spirulina supplementation improved exercise performance and delayed fatigue in moderately trained individuals. However, these effects are often modest and not universally observed across all research.

Despite promising findings, the current body of evidence is limited by small sample sizes and short study durations. There is a lack of large, high-quality clinical trials directly linking algae supplementation to significant improvements in muscle mass or strength for bodybuilders. Overall, while algae offer a nutrient-rich supplement that may support general health and recovery, their direct impact on bodybuilding outcomes remains only partially validated scientifically.