Dried and ground Rosmarinus officinalis leaf makes rosemary powder. This spice doubles as a supplement. Many use it to support digestion, and some find it helps with memory and focus, though the research is preliminary. Capsules or mixing into food are the usual ways to take it.
Pregnant women should avoid medicinal amounts because rosemary might stimulate the uterus. If you have a seizure disorder, steer clear of high doses, especially concentrated forms, since rosemary can lower the seizure threshold. High doses may also interact with blood-thinning medications by mildly thinning the blood.