Spirulina

Eye health
Spirulina contains the antioxidant beta carotene. The body converts beta carotene into vitamin.

Oral health
Spirulina has shown promise for treating and preventing gum disease and other oral health problems.

Losing weight
A 2020 reviewTrusted Source concludes that including spirulina in the diet could help reduce:
body mass index (BMI)
body fat
waist circumference
appetite
blood lipids
One possible reason is that ingredients in spirulina prevent the small intestine from absorbing as much fat.
Improving gut health
Spirulina does not contain much fiber, so people should eat it alongside other gut-healthful, high fiber foods.

Managing glucose levels
Spirulina may help manage blood sugar levels, which is important for people with diabetes.
lower blood sugar
higher insulin levels
improved liver enzyme markers

Reducing blood pressure
As well as lowering cholesterol, spirulina may help manage blood pressure.
Preventing heart disease
High blood pressure and cholesterol levels are both linked to heart disease.

Boosting metabolism
Spirulina may help boost a person’s basal metabolism. A higher metabolic rate may increase the number of calories they burn, which may aid weight loss.
Managing allergic rhinitis
When a person has allergies to pollen, dust, or pets, the inside of their nose may swell. This reaction is called allergic rhinitis. There is some evidence that spirulina could help improve the symptoms of this condition.

Antitoxic action
In some places, there is a risk of poisoning from contaminated drinking water and other sources of pollutants.
In 2016, a review found evidence of antitoxic properties in spirulina that could make it useful alongside other treatments for counteracting pollutants, such as:
arsenic
fluoride
iron
lead
mercury

Supporting mental health
The theory is that spirulina is a source of tryptophan, an amino acid that supports serotonin production. Serotonin plays an important role in mental health.
Depression, anxiety, and other mental health conditions can involve low levels of serotonin. Taking tryptophan supplements to maintain serotonin levels could help support mental well-being.