If you are trying CBD for the first time, here are several things to consider:
1) A higher amount of CBD does not necessarily guarantee the product will be more effective. At a higher concentration, you will just need to use less of the product—than one with a lower concentration—to achieve the same dosage.
2) If you are seeking to treat severe pain, CBD alone is not likely to provide ample, long-lasting relief. Look for products with at least some trace of THC ("full spectrum" if derived from hemp) or purchase products from a cannabis dispensary that contain higher amounts of THC.
3) Don't expect your experience with CBD to be like your experience with THC—CBD is more subtle. You will not feel "high", and you may not feel the effects immediately. Give CBD at least two weeks to one month to work (as you would with any other supplement) while your body returns to homeostasis, or a more balanced state.
4) In addition to taking CBD, make sure you are eating clean, getting at least 30 minutes of light exercise every day, and cutting back on unhealthy habits. CBD is not a miracle supplement but can help regulate your endocannabinoid system over time.
Read more about Frequently Asked Questions about CBD.