As per our listing our advice to customers is to build up the dose gradually as some people may have detox symptoms such as sickness and headaches, whilst other people may have no reaction at all, this does not mean that the Spirulina is of inferior quality.
“Sevenhills Organics Spirulina is a concentrated source of nutrients. Some customers can occasionally experience detox effects such as headache or nausea. If you are trying it for the first time, we suggest that you take a small amount to begin with, and build up to the recommended amount over several days.”