piperine - pro - nanolipospheres as a novel oral delivery system of cannabinoids : pharmacokinetic evaluation in healthy volunteers in comparison to buccal spray administration .
the effect of pro nanolipospheres ( pnl ) formulation containing natural absorption enhancers on the oral bioavailability of delta - 9 - tetrahydrocannabinol ( thc ) and cannabidiol ( cbd ) in a rat model .