Categories: Medicinal plants

Main side effects of spirulina

Discover the main side effects of spirulina.

Spirulina has numerous beneficial health effects, but misuse of this algae can lead to harmful side effects for the body. 

The spirulina is an alga known for being a great source of protein, vitamins, and minerals.

This supplement has great nutritional value, in addition to having a powerful satiating effect for those who consume it because they want to eat less and lose weight.


It does not matter if it is in powder, capsules, or tablets, spirulina can be used as a complement to a balanced diet. We can take it 15 minutes before each meal with two glasses of water to promote weight loss.

In most cases, this seaweed is sold as a ” superfood ” and a supplement that is the most nutritious in the world.

However, spirulina is still an alga that if we want to ingest constantly we must consult with our family doctor or a specialist.

Otherwise, we may misuse this alga, giving rise to a series of counterproductive effects to what we are looking for.

Although spirulina is a natural product, this does not mean that it does not have side effects and that its excessive consumption cannot lead to different complications.


If we are consuming spirulina to lose weight or to complement our physical exercise, we must be very attentive to the signals that our body sends us.

In the case of noticing something strange or unusual, we recommend not continuing to ingest it.

In this case, if you suffer from any type of disease, it is recommended that you consult a specialist to guide you on how to consume it.

These are the side effects of spirulina

Spirulina has great properties that range from its antioxidant, antiviral, and anti-inflammatory factors, to its benefits to lower cholesterol and triglycerides.

However, we must brand ourselves that spirulina is not a medicine, so we must always take it in the appropriate doses.


For this reason, taking it under various circumstances can lead to different side effects that can range from constipation to anxiety.

These are some of the most common side effects of spirulina that does not suit us well:

▪ Thirst and constipation

▪ Fever

▪ Dizziness


▪ Stomach ache

▪ Itchy or rash on the skin

▪ Headaches

▪ Iodine can affect people with hyper or hypothyroidism.

Other side effects

In addition, we must be careful if we combine the consumption of spirulina with some type of medicine, as this could be counterproductive for both.


As we have pointed out, spirulina can lead to an excess of iodine in our body, so thyroid patients are advised not to take this supplement, as it could lead to hyperthyroidism.

Hyperthyroidism occurs when consumed regularly products rich in iodine such as spirulina; which can contribute to the development of hyperthyroidism or worsen thyroid symptoms.

This occurs when the thyroid gland produces too much thyroid hormone, this can lead to insomnia, elevated heart rate, weight loss, and anxiety.

In addition to these series of side effects, the following groups of people should avoid consuming spirulina at all costs:

▪ People taking medications that may increase the risk of bleeding.


▪ Pregnant women or breastfeeding children.

▪ People with hyperuricemia, hyperthyroidism, phenylketonuria, or some liver diseases and autoimmune diseases.

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