Scent can be powerful in creating a productive state, so take advantage of this power by using an aromatherapy diffuser. From Jim Kwik’s book Limitless, I learned that peppermint and lemon promote concentration. As I’m writing this, my Vitruvi Diffuser is exhaling geranium (which is known to have a unique effect of both calming and stimulating). As for the essential oils, I like the brand Doterra.
Source: Ben Meer