Spirulina is a nutrient-rich blue-green algae sometimes used to improve nutrition or as a form of alternative medicine, although there isn't enough scientific evidence to recommend it for treating any health condition, according to the University of Maryland Medical Center. It may not be safe for everyone, so check with your doctor before adding it to your daily routine.
Side Effects
If you take spirulina, it could cause certain side effects, including nausea, stomach pain, vomiting, thirst, weakness, rapid heartbeat, liver damage or shock. This supplement is generally considered safe even when taken in high amounts, however. The side effects are most likely if your spirulina is contaminated, so be sure to purchase this product from a reputable source that has tested it for contaminants.
Potential Medication Interactions
Although no medication interactions are well-documented, spirulina may interact with medications that suppress your immune system and with blood thinners. If you are on these medications, you'll want to either avoid spirulina entirely or take it under the supervision of your doctor.