30C is ideal for active or acute over the counter use. It can be used when there is an emotional and/or a physical element to the condition, such as occasional sleeplessness. 30C remedies should be taken as a short course only, unless prescribed by a practitioner. 30C is ideal for active or acute over the counter use. It can be used when there is an emotional and/or a physical element to the condition, such as occasional sleeplessness. 30C remedies should be taken as a short course only, unless prescribed by a practitioner.