We recommend that both men and women should ideally start to take a DHA supplement three to four months in advance of trying to conceive; but it is still worthwhile starting at any time prior to conception, or during pregnancy, for women. 8 out of 10 women enter pregnancy deficient in this essential fatty acid. It is important to take some form of DHA supplementation so that you can build your reserves for your developing baby. DHA supplementation has an important role to play for men too. It is thought that over 40% of cases of sub-fertility or infertility are now due to male factor problems (such as low quality sperm or low sperm motility) where deficiencies in DHA may be a contributory influence.