I put a ⅓ dropper full in about 2 oz. water. Since I use it to get back to sleep, I leave it on my bathroom counter and take a sip or two on bathroom run. You have to dilute in water. Read on Herb Pharma’s site.

As for the cilantro drops from Herb Pharm, I started out with just two drops in a tiny glass of water, and I did this twice per day approximately 12 hours apart. Over almost two months, I have worked my way up to 6 drops twice per day. I would suggest that you completely ignore the recommended dosage on the bottle label. If you go to the Amazon.com website for this product and read a bunch of the reviews, you will see why. A few people started out following those directions and got seriously ill. The reason is that cilantro helps your body detox from foreign substances, heavy metals or chemicals you might have been exposed to, for example. If you detox too rapidly, you get sick. You will just have to experiment to see what works for you. I think @cindytxrunner takes more than me, but I'm not sure. I am also taking one large chlorella pill from Now Foods twice per day about 45 minutes to an hour before the cilantro drops in water. This is another detoxing substance. Here is an article that says why they think the two substances should be used in conjunction with one another. If you do an online search for "cilantro and chlorella detox" there are many such articles. https://naturalsociety.com/proper-heavy-metal-chelation-cilantro-chlorella/
Good luck!