It really depends on the size of your diffuser. The combination, I think is based on your preference, but the total drops should be 6-7 for a 100 – 150 ml water tank, and 8-10 for a 200-350 ml tank. I also have a 750 ml diffuser/vaporizer I haven’t used yet, so I am thinking I would use 15-20 drops in that. I would start on the lighter side, and then increase to the higher recommended amount based on your tolerance. I began using EOs starting with diffusing lavender and a Good Nite blend last summer to help me sleep, as I couldn’t fall asleep and stay asleep. Now I am educating myself in all the benefits, and am slowly becoming addicted.
Hey! Sorry to be commenting on such an old post, I was googling and found you. =) You have a lot of helpful information posted, I really appreciate it! I am a nursing student and I’ve just started to use essential oils for studying and test taxing anxiety. I am using lavender and rosemary because I’ve read a lot of research on these and they seem to be scientifically proven to help with testing. I also have ADHD and of course like all nursing students, a ton of test taking anxiety. I am wondering if I could combine the two oils to help me with my exams? If so what would your ratio recommendation be? The rosemary alone seems to help me concentrate a lot (probably as much as my adderall) but I feel more anxious when using it (also like when I take my adderall). The lavender alone makes me so relaxed I’m a little on the fuzzy side. I have done both of these with the diffuser and applying topically with fractioned coconut oil. When I apply topically I make a rollerball with 10mL of fractioned coconut oil and 20 drops of essential oil. Any advice or tips you can give would be greatly appreciated!

I’m not sure blending a bunch of citrus oils together will necessarily make it stronger as they all have different scents that would layer together, and I believe they’re all top notes. If you like citrus scents, maybe research which of those are top and middle notes and find a base note that blends well with citrus scents to round it out well. Also, the more carrier oil you use (“almond drops”) the weaker the scent will be. Hope this helps some Ali!
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