Delta-9-THC concentration is a measure of the amount of tetrahydrocannabinol (THC) present in a sample of cannabis. It is typically expressed as a percentage of the dry weight of the sample. The legal limit for Delta-9 THC concentration in most countries is 0.3 percent or less on a dry weight basis, with a theoretical total concentration (content) of THC of 1 percent or less. High-performance liquid chromatography (HPLC) is the most accurate method for measuring Delta-9 THC concentration, as it does not require the conversion of THCA to THC Delta-9.Recent trends in cannabis use have seen an increase in the average THC content and the popularity of seedless cannabis, which has no antipsychotic cannabinoid CBD.
This suggests that users susceptible to the harmful psychological effects associated with high doses of THC are at an increasing risk. It is important to be aware of the Delta-9 THC concentration when consuming cannabis, as it can have a significant impact on the effects experienced.