I copied from the group you could join there's lots of info & stories:
Turmeric powder @ 3% curcumin (possibly a little higher in some batches) is effective and can be safely used daily for a lifetime, in most cases. Always check first with your treating doctor if you have any chronic health issues, or if you have any doubts.
Turmeric tablets and capsules, produced commercially, @ 95% curcumin, are not recommended for ingestion beyond three months. (This is what I consider High-dose turmeric)
Note from Pie Pony; "At very high doses turmeric should not be taken for periods beyond 3 months at a time, although as a food rather than a manufactured capsule, actually absorbing high doses of turmeric is relatively difficult and why the scientists are looking at nano tech solutions ( like lipid jackets or envelopes) in order to deliver the complex amino acid chains to the blood stream.
Turmeric can be safely included as food every day.
Following an accident it was essential I reduce swelling and inflammation, so I did take more than 100 grams of turmeric powder a day for the first 3 days, then 50 grams a day, then back to 4 to 6 teaspoons a day.
Compared to most prescription drugs, taking large quantities of turmeric powder in golden milk, yoghurt, scrambled eggs, casseroles etc is unlikely to have many downsides, as excess will simply be excreted, where prescription drugs come with list of side effects and often require a second prescription drug to offset the problems caused by the first medicine!
Understanding how to maintain healthy gut flora, sustain a balanced defense and strong immune system is key to fighting disease and illness.
Turmeric can help as part of maintaining a healthy digestive tract and reducing inflammation which can lead to many other illnesses including a variety of cancers, arthritis, allergies, irritable bowel etc, etc."
Thanks to Roy Webb for this link, with information on restrictions using curcumin (as opposed to turmeric containing curcumin) Can turmeric prevent or treat cancer? : Cancer Research UK : CancerHelp UK