Getting Higher On DXM (with DXO) from Pepper
About 600-900 mg of Bioperine Black Pepper Extract would be enough for effective potentiation.
What you choose to do is completely your responsibility.
P.S. I do not specify this in the video, but do not take Turmeric as it is an effective NMDA glutamate receptor activator which will prevent you from being as high on an NMDA receptor antagonist.
https://www.sciencedirect.com/science/article/pii/S0278584612002102
Informational Links-
Cannabidiol Being a Potent CYP2D6 inhibitor-
https://www.ncbi.nlm.nih.gov/pubmed/21821735
Black Pepper alkamides being potent CYP2D6 inhibitors-
https://www.ncbi.nlm.nih.gov/pubmed/16808005
Health Benefits of Black Pepper-
https://www.organicfacts.net/health-benefits/herbs-and-spices/health-benefits-of-black-pepper.html
CB2 agonists being 5HT2A upregulators-
https://www.ncbi.nlm.nih.gov/pubmed/23151877
Beta Caryophyllene in Black Pepper Being a CB2 agonist-
https://www.leafscience.com/2013/11/12/beta-caryophyllene-dietary-cannabinoid-make-synthetics-irrelevant/