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Building Muscle: The Categories and How They Differ

Androgens, growth factors and secretagogues serve this goal by different routes, on different timescales, with different monitoring requirements.

The compounds in this category divide cleanly into three groups. Anabolic-androgenic steroids act at the androgen receptor. Growth hormone and its secretagogues act through the GH and IGF-1 axis. Insulin-like growth factors act directly at the IGF-1 receptor. These are separate pathways, which is why they appear together in the literature rather than as alternatives.

Within the androgen group, the meaningful distinctions are whether a compound aromatises, whether it is 5-alpha reduced, and what its ester or oral structure implies for pharmacokinetics and for the liver. Those properties belong to the parent hormone and its structure, not to the brand on the vial.

The GH side works on a much longer timescale. Growth hormone and secretagogue effects on body composition are measured in months in the clinical literature, not weeks, and the response is far more variable between individuals than the androgen response.

What to weigh up

Aromatising or not changes everything downstream

Whether a compound converts to oestrogen determines whether an aromatase inhibitor has anything to act on. Non-aromatising does not mean non-oestrogenic - oxymetholone is the exception that proves it.

Orals and injectables are not a convenience choice

Most orals are 17-alpha-alkylated, which is what makes them orally active and what carries the hepatic consideration. That is structural, not incidental.

Suppression is universal

Every exogenous androgen suppresses the HPTA through negative feedback, regardless of compound or intent. Planning for recovery is part of planning the cycle, not an afterthought.

Bloodwork before, not after

A baseline panel is the only way to interpret a later one. Without it there is no way to distinguish a change from a pre-existing state.