DEAR DR. BLONZ: I do not eat much fish, and my doctor suggested taking fish oil capsules. My question is whether flaxseed oil is an effective alternative source of omega-3 fatty acids. That means that while fish oil omega-3s are ready for the job, our bodies need to elongate plant omega-3s before using them. Regardless of the source, omega-3 fatty acids must be stored properly as they are quite reactive. For more information on omega-3 fatty acids from the National Institutes of Health, see b.link/EFAs.