Algal protein, derived from sources such as spirulina and chlorella, has been investigated for its potential to support bodybuilding and muscle growth. The primary scientific rationale for its use lies in its high protein content and favorable amino acid profile, which are important for muscle repair and synthesis following resistance training. Several studies have demonstrated that spirulina, in particular, contains all essential amino acids and is rich in branched-chain amino acids (BCAAs), key nutrients for muscle protein synthesis.

Research comparing algal proteins to conventional animal-based proteins suggests that while algal proteins are somewhat lower in certain essential amino acids (e.g., methionine), they are still capable of contributing meaningfully to daily protein intake. Additionally, algal protein is often well-tolerated and may offer anti-inflammatory and antioxidant properties, which could support recovery from intense exercise, though these effects are less directly tied to muscle building.

Direct clinical trials specifically examining algal protein supplementation for increases in muscle mass or strength in bodybuilders are limited. Most evidence comes from broader nutritional studies or short-term interventions assessing protein digestibility and bioavailability. Therefore, while there is moderate scientific support for the use of algal protein as a viable plant-based protein source for athletes and bodybuilders, more targeted research is necessary to confirm its efficacy relative to established protein sources like whey or casein.