Displaying 4 results of Docosahexaenoic Acid Impurities Docosahexaenoic acid (DHA) is an omega-3 fatty acid that is commonly used in dietary supplements and infant formulas. However, DHA can often contain impurities such as heavy metals, PCBs, and dioxins. These impurities can be harmful to human health and can cause adverse effects such as developmental delays, immune system damage, and cancer. It is important to ensure that DHA supplements are thoroughly tested for impurities to ensure their safety and efficacy.