Cellulosa powder. Appearance and size will be the same for active and placebo. clinical trials

A randomized double-blind placebo-controlled study with ASA treatment in colorectal cancer patients with mutations in the PI3K signaling pathway

This study looks at whether a daily aspirin-like tablet helps people with certain types of bowel cancer (colon or rectal cancer) that have specific gene changes. It compares the tablet to a dummy pill to see if it stops the cancer from coming back.