[header] How to get rid of a headache using mallow [title] Buy mallow from a health food store. [step] Mallow can be purchased at some specialty health food stores, or online. Try a store that sells other herbs and/or essential oils. 
Some stores that specialize in traditional chinese medicine, herbs, and healing might also carry mallow. It might be a good idea to call around to a few places to see what stores near you carry it.