Weight gain

Patient: I am a 52 year old female. I had hodgkins disease when I was 34 and had radiation and chemo. Have been taken off HRT 6 months ago and have piled on weight due to under active thyroid originating from radiation. On 75mcg of thyroxin and water pills, bendrofluazide (excluse spelling). Can I take the Acai berry and colon cleanse products on the market to help lose some weight or isn’t this advisable due to medical history and medication?