RPB
Guide 06

Cycling & stacking — the concepts

You will see “cycles” and “stacks” everywhere peptides are discussed. This guide explains what the words mean and what the research does and doesn’t say. It doesn’t suggest any combination.

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Draft content — pending editorial and medical review.

Cycles and washouts

A cycle is a planned period on a compound, followed by a planned period off — the . Researchers use washouts so that later measurements can be compared against a clean .

For most research peptides, there is no published evidence for a specific cycle length. Where community reports describe one, the Builder labels it as community-reported.

Combinations

A “stack” is two or more compounds used in the same period. Very few combinations have been studied together in humans. Profiles list compounds “commonly studied alongside” as information only.

The Builder flags combinations that act on the same pathway, or that the profiles document as interacting with medicines. Flags are information, never a verdict, and never block saving.

Checkpoints

A re-evaluation checkpoint is a date in the plan where you look at your log and before continuing. It is the most useful part of any cycle, and the one most often skipped.

Common mistakes

Changing several things at once. If two compounds start the same day, the log can’t tell you which did what.
No baseline. Without one, there is nothing to compare the cycle against.
Mistaking community conventions for evidence. A common pattern is not a tested one.