What we do know so far is that some CBD is transferred to babies through breast milk. Full-spectrum CBD. Full-spectrum CBD extracts contain all of the naturally occurring compounds from the plant they’re extracted from, including THC. The form used, dosage, and your body composition all play a role and make it hard to predict how quickly CBD will kick in or how it will affect you. Your digestive system metabolizes edible forms of CBD, which can take a while. Creams and lotions are also slow to get into and out of the body.