Cycling on and off: what the breaks are actually for

The first is receptor desensitisation. Continuous exposure blunts the response over time. This is well established for some receptors and simply assumed for others. Where it holds — it argues for breaks specifically — not for smaller doses.

The second is plainer: less total exposure to a compound nobody has characterised over the long term. This applies to nearly everything described here, and it does not depend on the first argument being true.

The distinction matters because the second reason has no optimal schedule waiting to be discovered. If the point is less cumulative exposure, then less is less. Arguing four weeks off against three is arguing about a number nobody has measured.

Mixed vials do not wait for you. A break long enough to matter usually outlasts a reconstituted vial's fridge life, so the end of a block is the place to finish one or bin it, not to pause halfway through.

Anything prescribed is a different conversation entirely. Stopping a prescribed drug because a protocol on a forum says to cycle is a decision for whoever prescribed it. With the incretin agonists specifically, stopping is generally followed by weight coming back.