There is a tiny percentage of curcumin in tumeric, and it is very poorly absorbed by the body; absorption is increased by the peperine in black pepper. The peperine can irritate the GI tract in some people (me). I have IgA kappa MGUS and take 1000 mg 2x/day of bioavailable curcumin capsules. The curcumin is modified slightly to increase absorption by the GI tract and retention in ones body (by attaching a lipid [fat] to the curcumin molecules, for example}. Research suggests curcumin is useful for moderating kappa levels, although studies and results are still limited. I'm good with being a lab rat. https://pubs.acs.org/doi/10.1021/acsomega.2c07326
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9881416/#:~:text=Curcumin%20is%20the%20most%20important,of%20the%20root%20(30).