Microalgae for Physical and Mental Wellbeing

    Microalgae are gaining attention as natural, nutrient-rich ingredients that may support both physical and mental well-being. Through the gut–brain axis, nutrition can influence how we feel, think, and respond to stress. Compounds found in microalgae—such as antioxidants, essential fatty acids, vitamins, and minerals—may help reduce inflammation, support neurotransmitter balance, and improve the body’s ability to cope with stress. Because of these combined effects, microalgae are increasingly being explored not only for general health but also for their potential to support mood, resilience, and cognitive function.

    In a four-week, double-blind clinical trial, 56 adults with mild digestive discomfort were given either a microalgae extract (Tetradesmus obliquus) or a placebo. Those taking the extract showed clear improvements in digestive health, including reductions in constipation and indigestion. Beyond gut benefits, participants also experienced greater reductions in negative mood compared to the placebo group. A biological stress marker in the blood, chromogranin A, decreased as well, suggesting that the effects were not only perceived but also measurable at a physiological level. Researchers also observed early signs of increased diversity in the gut microbiome, which is generally considered a positive indicator of gut health. However, these findings were modest and require further confirmation. Importantly, the supplement was well-tolerated and did not negatively affect cardiovascular health (1).

    Chronic stress can disrupt the body’s internal balance by affecting the nervous, hormonal, and immune systems. Over time, this imbalance may contribute to poor sleep, fatigue, and reduced daily performance. Euglena gracilis, a unique microalga rich in vitamins, minerals, amino acids, and healthy fats, has been studied for its potential to support the body under these conditions (2). In a 12-week clinical study involving adults aged 20–64, participants who took Euglena showed improved regulation of their stress response, particularly in how their nervous system reacted during mentally demanding tasks. Alongside this improved stress resilience, participants reported better mood and improved sleep quality over time, suggesting benefits for both mental recovery and overall well-being (2).

    Some microalgae-derived compounds may also support both physical and mental performance. Astaxanthin, a natural antioxidant pigment from marine microalgae, has been studied for its combined effects on cardiovascular function and mood (3). In an eight-week clinical trial, 28 healthy adults taking 12 mg/day of astaxanthin showed about a 10% lower heart rate during moderate exercise, indicating improved cardiovascular efficiency and endurance capacity. At the same time, they experienced meaningful improvements in mood, including a 57% reduction in depression and a 36% reduction in fatigue, along with overall improvements in mood scores. These findings suggest that astaxanthin may help support both physical performance and emotional well-being simultaneously (3).

    Taken together, these studies highlight the potential of microalgae as multifunctional nutrition ingredients. Different types appear to support health in complementary ways—improving digestion, enhancing the body’s response to stress, supporting sleep quality, and benefiting both physical and mental performance. While more research is needed, especially in individuals with higher stress levels or clinical conditions, current evidence suggests that microalgae may offer a natural, integrated approach to supporting overall well-being.

References:

1.     Maltz S, Nacey AT, Maury J, Ghanem N, Lee SY, Aquilino TM, Graham EL, Wrigley SD, Whittington JM, Khandaker AM, Hart RA, Byrne L, Wei Y, Pradelles R, Johnson SA, Weir TL. Effects of Supplementation with Microalgae Extract from Tetradesmus obliquus Strain Mi175.B1.a on Gastrointestinal Symptoms and Mental Health in Healthy Adults: A Pilot Randomized, Double-Blind, Placebo-Controlled, Parallel-Arm Trial. Nutrients. 2025 Mar 10;17(6):960. doi: 10.3390/nu17060960. PMID: 40289936; PMCID: PMC11944429.

2.     Nakashima A, Yasuda K, Murata A, Suzuki K, Miura N. Effects of Euglena gracilis Intake on Mood and Autonomic Activity under Mental Workload, and Subjective Sleep Quality: A Randomized, Double-Blind, Placebo-Controlled Trial. Nutrients. 2020 Oct 23;12(11):3243. doi: 10.3390/nu12113243. PMID: 33113956; PMCID: PMC7690740.

3.     Talbott S.M., Hantla D., Capelli B., Ding L., Li Y., Artaria C. Effect of Astaxanthin Supplementation on Psychophysiological Heart-Brain Axis Dynamics in Healthy Subjects. Funct. Foods Health Dis. 2019;9:521. doi: 10.31989/ffhd.v9i8.636.

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