<<Disclaimer: Verify this information before applying it to your situation.>> I just spoke with Astra 1-800-236-9933 regarding Prilosec. All strengths of Prilosec ARE GF. A very small amount of lactose is in the pill. Maizy MedSupport Celiac Chat Host Monday (weekly) Celiac Live Chats From 8-10 PM EST at: http://www.medsupport.org/celianav.htm