"Science: With the use of CANNABIS TEA only a small proportion of THC in the CANNABIS is ingested

The users of medicinal CANNABIS in The Netherlands are advised by the Office of Medicinal CANNABIS to prepare CANNABIS TEA as follows: "add 1.0 g of CANNABIS to 1.0 L of boiling water and let simmer for 15 min. Filter out solid parts by using a common TEA-sieve. TEA can be consumed immediately, or stored in a closed bottle in a refrigerator for up to 5 days."

Researchers of the University of Leiden investigated the cannabinoid composition of this TEA. They found that TEA prepared with different batches of CANNABIS with an overall THC concentration (phenolic THC + THC acid) of 19.7 per cent showed only a moderate variation in THC concentrations of 15 per cent. The mean concentration of THC was 10 mg per litre and of THC acid (THCA) 43 mg/L. In the plant THC is mainly present as THCA and is converted into the psychotropic THC upon heating (baking, smoking, boiling). Since with cooking of water only a relatively low temperature of 100 degrees Celsius is reached only a small part of THCA was transformed into THC, resulting in an availability of only about 5 per cent phenolic THC of the whole THC (10 mg of 197 mg THC acid + THC). The authors also found, that the THC concentration rapidly declined during storage, which was largely prevented by the addition of coffee creamer powder.

(Source: Hazekamp A, Bastola K, Rashidi H, Bender J, Verpoorte R. CANNABIS TEA revisited: A systematic evaluation of the cannabinoid composition of CANNABIS TEA. J Ethnopharmacol 2007 May 24; [Electronic publication ahead of print])" ???? :hippy: