Curcumin has a problem with getting absorbed in effective amounts in the tissues. Thats why its a good colon cancer preventative as a lot goes down into the bowel.
Curcumin has come to the attention of big pharma and they are researching ways to increase bioavailability prior to attempting to create a synthetic drug. Good luck with that say I.
For supplements the best way to get maximum bioavailability is to break open 4 capsules(I use 500mg caps with bioperine) into a dessertspoon of virgin olive oil. This gives a daily dose of 2 grams and then pour it into a small bottle and place the bottle into warm water and let it heat up before consuming.
Research has found that this way curcumin absorption is increased 12 fold over just consuming caps the normal way. Its almost as effective absorption as liposomol curcumin.
https://www.liebertonline.com/doi/abs...9/adt.2007.064