Melatonin doesn’t just come in supplement form — it’s actually a hormone that your body naturally produces to help regulate your sleep-wake cycle, says Dr. Vikki Petersen, CCN, a certified functional medicine practitioner, clinical nutritionist, [...] Lately, people have been turning to vapes for their dose of melatonin. Vapes, aka a sort of pen or e-cigarette you inhale from, are commonly used to inhale nicotine, weed, or flavored vapor to get the desired effect without actually smoking the substance, says Dr. Brian Koo, MD, a sleep medicine specialist [...]