HCL Betaine with Pepsin Question

Hi everyone,
I have a question about HCL Betaine. Does anyone know of any protocols explaining how long it can be taken and in what doses? I am a 47 year old, 175 pound male and have been taking 6 Thorne Betaine HCL Pepsin capsules with each meal that has protein. Each capsule contains 520 mg Betaine HCL and 20 mg Pepsin. I have been at this level since June 2015. The effects have been very positive. A number of food sensitivities /allergies cleared up almost overnight. How long can I stay at this dosage? Can I take more to clear up remaining sensitivities? Are there side effects to watch out for? Thanks!