Cycle: What On/Off Cycling Means
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Cycle (on/off cycling)

Also called cycling, on-cycle, off-cycle, post-cycle · Reviewed

Definition: A cycle is a planned stretch of taking a compound followed by a stretch off it, such as "8 weeks on, 4 weeks off". The word comes from bodybuilding use of anabolic steroids and is now used for peptides too. It is a community word; prescription TRT is normally an ongoing schedule, not a cycle.

What the evidence says

For testosterone and other androgens, the main known effect of an "on" period is that the body's own hormone system shuts down. A 2025 review says androgen use always suppresses this system. Most people recover after stopping, but some stay low for months or years.

Post-cycle therapy (drugs taken after a cycle to speed recovery) is common, but a 2026 commentary notes there is limited evidence that it works.

The Depo-Testosterone label describes replacement as an ongoing schedule of 50-400 mg every two to four weeks. For research peptides, FDA has found little or no human safety data for many of them, so no on/off schedule has been tested.

Worked example

Mapping "8 on, 4 off" onto a calendar

  1. One full round is 8 + 4 = 12 weeks.
  2. A year has 52 weeks: 52 ÷ 12 = about 4.3 rounds.
  3. Starting January 1, the first off period starts in week 9, around February 26.

Why it matters when you track doses

An off period is easy to blur, and so is the start of the next one. Log the start and end date of each phase. If you get blood work, note which phase you were in; a level drawn mid-cycle and one drawn after a few weeks off are not comparable.

Read more on Dose Track: Testosterone cypionate guide · TRT and steady state · Clomiphene guide

General education drawn from labels and published studies, not personal medical advice. Your prescriber, pharmacist and the label that came with your product are the final word.
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Frequently asked questions

Is TRT a cycle?+
Not normally. The Depo-Testosterone label describes replacement as an ongoing schedule, every two to four weeks. Cycling is a bodybuilding pattern.
Does the body recover after a steroid cycle?+
Most people recover their own hormone production after stopping, but a 2025 review describes a subset who stay low for months or even years.
Do peptides need to be cycled?+
There is no tested basis either way. For many research peptides FDA has found little or no human safety data at all.

Sources

  1. van Os et al. Front Endocrinol 2025 (prolonged hypogonadism after androgen abuse). PMID 40678315
  2. Grant and Jayasena. Endocr Connect 2026 (post-cycle therapy after androgen abuse). PMID 42847916
  3. Depo-Testosterone (testosterone cypionate) US label, DailyMed
  4. FDA: Certain bulk drug substances for use in compounding that may present significant safety risks

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