Moringa leaf powder, for one, packs more iron per gram than most people expect from a leaf you can grow in a backyard. Add it to soups or smoothies a spoon at a time.
Beetroot, cashew and almond round out a short list of ingredients that do a lot of nutritional work without changing how you already cook. Chia and flax seed are the newer additions — both work well soaked overnight into a simple pudding or stirred into pap.
None of these need a health-food store; they just need to actually be fresh when they reach you, which is the part we focus on.