FFAR2

In one line: A gut receptor that responds to the good byproducts your friendly bacteria make.

FFAR2 is a receptor in your gut that responds to short-chain fatty acids — helpful molecules (especially butyrate) that your friendly gut bacteria produce when they ferment fibre. Activating it strengthens the gut lining, calms inflammation, and helps regulate appetite and blood sugar.

This is the science behind prebiotic fibre: you're not adding bacteria, you're feeding the good ones you already have so they make more of these beneficial molecules. Feed the garden, and this receptor gets the signals that keep your gut healthy.