Algal protein, derived from various species of algae such as spirulina and chlorella, has been investigated for its potential to support muscle health, primarily due to its high protein content and favorable amino acid profile. Scientific evidence supporting its use for improving or maintaining muscle tone is limited but emerging. Most studies to date have focused on the general nutritional benefits of algal protein, including its digestibility and content of essential amino acids, which are necessary for muscle protein synthesis. Some small-scale human and animal studies indicate that supplementation with algal protein can support muscle maintenance or recovery, comparable to more traditional protein sources, particularly in vegetarian or vegan populations. However, there is no robust clinical evidence directly linking algal protein supplementation to improvements in muscle tone in populations with muscle tone deficiencies (such as those with hypotonia or age-related muscle loss). The majority of existing research supports its use as an alternative protein source rather than a targeted treatment for lack of muscle tone. Thus, while algal protein may contribute to overall protein intake necessary for muscle health, high-quality, large-scale randomized controlled trials are required to substantiate its specific efficacy for treating or supporting muscle tone deficiencies.