Organic shampoo is safe and effective, but the use of this natural ingredient is associated with allergic reactions in some people.
The New York Times reports that a group of people in the US and abroad experienced allergic reactions after using a product that was marketed as a natural alternative to salon shampoo.
The newspaper cites a review of more than 3,000 laboratory tests conducted by Dr. David S. Brown and his team at the New York University School of Medicine.
In the study, people using organic shampoo were found to have elevated levels of IgE, a type of antibody that is produced in response to an attack on the skin by bacteria, viruses and fungi.
They also had elevated levels on the surface of their bodies of an antibody called IgG, which is produced by immune cells to prevent inflammation and infections.
The study also found that some of those people were also more likely to have more severe allergic reactions, including eczema and eczemas in the eyes and nasal cavity.
This is a developing story.
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