One study examined 45 patients – both men and women – with known symptoms of peptic ulcers in the 16-60 age groups. 25 patients had gastric or duodenal ulcers. They were given 300mg of turmeric filled capsules 5 times daily, ½ to 1 hour before meals and at bedtime for 4 weeks. After 4 weeks, tests revealed that in 12 cases, the ulcers were absent and in 18 cases, further treatment for 8 weeks cured the ulcers. In 19 patients, the ulcers disappeared after 12 weeks. The remaining 20 patients did not have ulcers when tested. Instead they suffered from dyspepsia, gastritis and erosions to the stomach lining. They were given turmeric filled capsules for 4 weeks. Within the first 2 weeks, stomach discomfort and pain disappeared. They could also return to a normal diet. Hematological system, renal and liver functions and blood chemistry of all patients displayed no significant changes before and after taking turmeric capsules. Turmeric indeed did the trick here!
In another study, rats infected with H.pylori bacteria were given turmeric (curcuma longa). Their gastric acid secretion lessened and they did not develop gastric ulcers. This was believed to be because of the ability of turmeric to block H2 histamine receptors which then inhibited secretion of gastric acid and prevented formation of gastric ulcers. This strengthens ability of turmeric to fight harmful microbes.
http://turmericforhealth.com/turmeric-benefits/how-turmeric-helps-in-nausea-a...
Various clinical tests carried out on turmeric deem it to be generally safe for regular use. In determining the appropriate turmeric dosage to take on a daily basis though, it is preferable to take it in moderation. A concentrated dose of 50 mg to 100 mg can be quite sufficient if taking a turmeric supplement or a turmeric capsule. Dietary supplements may not be necessary if turmeric is made part of the normal diet; a few pinches of it can be added to vegetables, soups, casseroles, rice and other foods during cooking.
If taken in excess, there may be some side effects such as nausea and stomach upsets. A more major problem with taking turmeric in high amounts is that it acts as an anti-coagulant, that is, it prevents the blood from clotting in the event of an injury. Too much curcumin in the system may prevent wounds from healing fast, cause intestinal bleeding, and lead to further health complications.
Another issue to bear in mind is the chelating activity of turmeric. Turmeric dosage in moderate amounts can help the body get rid of a toxic excess of metals like iron and copper. If overdone, the chelating agents can impede the iron metabolic process, resulting in iron deficiency and anemia.
http://www.wisegeek.org/how-do-i-determine-the-appropriate-turmeric-dosage.htm
I like to mix it with certain foods like quinoa/vegetable stir fries,etc.
After posting I looked at the capsules I have, and they are 500 MG's, so I checked some more sites and came up with Dr. Weil's.
"How can you get more turmeric into your diet? One way is via turmeric tea. There are also extracts in tablet and capsule form available in health food stores; look for supercritical extracts in dosages of 400 to 600 mg, and take three times daily or as directed on the product.
And, of course, one can simply indulge in more curried dishes, either in restaurants or at home. However you do it, adding turmeric to your diet is one of the best moves toward optimal health you can make." http://www.drweil.com/drw/u/ART03001/Three-Reasons-to-Eat-Turmeric.html
There doesn't seem to be any agreement of the people who should know, so maybe you should seek advice from the medical Dr. that is familiar with your particular issue, and system.