In general, CBD can be inhaled, applied topically, ingested and taken sublingually (under the tongue).

The two things that need to be considered when deciding on a CBD delivery are:

1.  how long until it starts to work and
2. how much of the CBD is available for your body to use (bioavailability).

The fastest methods are inhalation and sublingual; topical application and ingestion are slower. Bioavailability is higher in sublingual methods followed by ingestion and inhalation. There have been no scientific studies for topical or transdermal products, according to a recent article from the Midwest Compassion Center. See: https://www.midwestcompassion.org/2018/01/08/cannabis-bioavailability-delivery-method-best/

Full-spectrum CBD contains natural terpenes and other cannabinoids CBDA, CBN, etc. Full-spectrum CBD is sensitive to heat. CBD Isolates contain only CBD and hold up well to heat. That’s one reason why they’re commonly used in edibles like candies that have to be cooked.

Most teas steep at temperatures above 175^oF in which case you should use a CBD isolate.  At 165^oF natural terpenes begin to ‘boil off’ and other chemical changes occur.  Use a traditional Japanese green tea (steeping temperature of 150^oF -160^oF) if using a full-spectrum CBD.