Gather fresh rosemary sprigs or dried rosemary
Rinse fresh rosemary and pat it dry completely
Fill a clean, dry glass jar with rosemary
Pour a carrier oil over the rosemary until fully covered
Use olive oil, jojoba oil, coconut oil, or almond oil
Seal the jar tightly
Place the jar in a warm, dark spot for 1 to 2 weeks
Shake the jar gently every day
Strain the oil through cheesecloth or a fine sieve
Transfer the strained oil into a clean glass bottle
Store the rosemary oil in a cool, dark place
Use within a few months for best quality