The former Weight Watchers spokeswoman recently launched Organic Liaison LLC after years of battling her size under the glare of the spotlight.
Members pay between $10 (£6) and $149 (£93) per month to follow the regime, which combines an organic food diet with vitamins and supplements.
Recent reports suggested money from the company was channelled directly into the church after links between Organic Liaison and Scientology were uncovered. The firm's accountant, Saul B Lipson, is a known Scientologist whose company is approved by the church and based near its headquarters in Clearwater, Florida. The board also features active Scientologist Michelle Seward.
But Alley, a practising Scientologist, insists the claims have no merit.
She says, "It's bulls**t. It's not true. The address in Clearwater is my accountant, and he's a Scientology Jew."