In general, if you are taking water soluble vitamins, minerals or other supplements you can continue taking these while you are cleansing. 

If you are required to take supplements with food or if you have concerns, please check with your health practitioner to see if you should keep taking them, or if cleansing is appropriate for your condition.

If you are currently taking prescription medications it is recommended that you speak with your health practitioner before undergoing a juice cleanse.