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Part 3.0 — The Eight Anabolic Pathways

14 min read

This is Part 3 of 5 in the Performance Enhancement Series — the "Tier 3" continuation of the Fitness Series' Pharmacology chapter. The full path:

Table of Contents

Framing

This article describes how multiple physiological pathways contribute to muscle growth and how enhanced athletes attempt to influence them. It is harm-reduction education built on the work of Vigorous Steve.[^1] It is not a protocol, a prescription, or medical advice. Compounds are named generically and for transparency; no doses are given for any anabolic or prescription compound. Doses are given for over-the-counter supplements, because those are legal and evidence-based. Every compound here carries risk and requires the screening, monitoring, and protection covered in the other articles.

The core idea: stop body-slamming one pathway

Most enhanced athletes do one thing: they push more and more androgen at the androgen receptor and ignore everything else. More testosterone, more trenbolone, higher and higher doses, chasing the same single mechanism until the side effects pile up and the health markers from Part 2 fall apart.

Vigorous Steve’s framework is the opposite, and it fits this series perfectly. His core philosophy: instead of body-slamming one pathway with high doses, marginally exploit multiple pathways — each one contributes maybe an extra 5–10% to your net gains, and tapping all of them adds up to more total muscle than abusing any single compound, with vastly fewer health risks.[^1]

There are eight distinct anabolic pathways worth optimizing. Think of them less as “drugs to take” and more as levers to nudge — most of them can be moved gently, several without harsh compounds at all.

The prerequisite Steve repeats — and so does this whole series

None of this works without proper baseline nutrition. This is the 90/10 rule from the Fit series in a different costume: the pathways are the margin. If training, calories, protein, and sleep aren’t already excellent, you are nudging levers attached to nothing. Optimize the work first; optimize the pathways second.

Choosing compounds by the job, not the hype

Before the pathways, one principle that turns “what should I take?” from a hype-driven question into an engineering one. In a separate article, Vigorous Steve catalogues the main and secondary reason to use each compound — the specific job it does best.[^5] You don't pick a compound because it's famous; you pick it because it does a job your protocol needs and your other compounds don't.

Three house rules for how this article uses that idea:

  • Compounds are named generically, never by brand. Sourcing quality gear is its own challenge — especially in Malaysia — and lab/brand names change constantly, so what matters is the molecule and the job, not a label. Verifying that what you have is real and correctly dosed is the Part 1 pre-flight problem, not this article’s.
  • Testosterone is the base; everything else earns its place. Steve’s framing of testosterone is blunt: its main job is “to increase everything about yourself beyond what your testicles can produce naturally.”[^5] Every other compound should answer a sharper question — what does it add that test alone, at a sane dose, doesn’t?
  • No anabolic doses here, by design. You’ll see supplement doses (legal, OTC, evidence-based) but never AAS or prescription doses. The point is which lever and why, not a copy-paste cycle.

Two lenses on the same compounds: pathway and family

This article sorts compounds by the pathway they work. Its companion, Part 3.1, sorts the same compounds by chemical family — Testosterone-family, DHT-family, or 19-Nortestosterone (19-nor) family. The family predicts a compound’s behaviour (does it aromatize? hold water? raise prolactin?); the pathway explains what it does. Below, each compound is tagged with its family — (T) Testosterone-family, (DHT) DHT-family, (19) 19-nor — so you can read both lenses at once. The pattern is consistent: DHT-family compounds tend to be the SHBG/restraint tools, 19-nors are the progesterone/cortisol tools, and the Testosterone-family supplies the aromatizing base.

With that, here’s the per-pathway toolbox.

Pathway 1 — The Androgen Receptor (AR)

The big one, and the one everyone already knows. This is the route targeted by anabolic-androgenic steroids (AAS) and SARMs. An androgen binds a receptor; the activated receptor translocates into the cell nucleus and drives transcription of DNA into RNA, which is read to synthesize new contractile protein. This is the dominant, most powerful muscle-building mechanism — and it’s exactly the one people overdose.

The under-appreciated detail: when an androgen receptor activates and moves to the nucleus, it leaves the cell membrane. Your body then has to replenish receptors. The number of available receptors — AR density — is itself a lever, and it’s the part most people never think to optimize.

Compounds that work this pathway (chosen by the job)

Every AAS acts here; they differ in side-effect profile and secondary traits. By job:[^5]

  • Testosterone (T) — the base of essentially every protocol; raises everything beyond natural capacity, and the same molecule used for TRT as natural production declines with age.
  • Boldenone (T) — offseason anabolism plus raised red blood cells and appetite; a common pick when simply adding more testosterone brings intolerable sides. (Watch hematocrit — Part 2.1.)
  • Methenolone / “Primo” (DHT) — milder anabolism with a “cosmetic” look, chosen when extra testosterone causes too many sides; also nudges red blood cells.
  • Turinabol (T → acts DHT-like) — offseason endurance and anabolism with low estrogenic activity — an option specifically when estrogenic sides are the problem.
  • Dianabol (T) / Anadrol (DHT → acts 19-nor-like) / Superdrol (DHT) — strong oral kickstarts for offseason strength and “fullness,” but these are the harsh, liver-toxic, lipid-wrecking orals; short windows only.
  • SARMs — included for completeness; Steve’s blunt view is that serious athletes favour AAS/GH/IGF-1 over SARMs.[^5]

Family key: (T) Testosterone-family · (DHT) DHT-family · (19) 19-nor — see Part 3.1.

Notice the logic: most of these exist to deliver AR anabolism while dodging a specific side effect of running more testosterone — not to be piled on top of an already-high test dose for its own sake.

Supplement & protocol support (science-backed)

The receptor-density play, expanded to what the evidence actually supports:

  • L-Carnitine L-Tartrate (LCLT), ~2 g/day. The strongest lever here: LCLT has been shown to upregulate androgen-receptor content in muscle following resistance exercise.[^6] More receptors means more of your existing androgen actually gets used. (Overlaps the Tier-1 recovery case for L-Carnitine.)
  • Zinc, ~25–30 mg/day (with ~1–2 mg copper to balance long-term). Zinc deficiency directly suppresses testosterone and androgen signalling; correcting a deficiency restores it — though supplementing beyond sufficiency adds nothing.[^7]
  • Selenium, ~100–200 mcg/day — supports androgen-mediated transcription and antioxidant defence; two Brazil nuts gets you there.
  • Vitamin D, dosed to a blood level of ~40–60 ng/mL. Vitamin D status tracks with testosterone; correcting deficiency helps, and it’s on your nutrient panel anyway.[^13]
  • Protocol — pin frequency for stable levels. Splitting the same weekly dose into more frequent injections keeps serum androgens (and estrogen) stable instead of spiking — smoother receptor occupancy and fewer estrogen swings (ties straight into Pathway 3).

Every item above is about getting more from a given dose — the opposite of dose-chasing.

Pathway 2 — The SHBG Receptor Complex

Sex Hormone-Binding Globulin (SHBG) gets a bad reputation as nothing more than a “sponge” that mops up free testosterone and lowers what’s bioavailable. That’s incomplete. Steve points out that the SHBG–receptor complex itself acts as a delivery system — a mailing service that carries androgens directly to tissues, where they can then activate nuclear androgen receptors.[^1] Drive SHBG too low and you damage that delivery mechanism.

This is why the reflex to “get SHBG as low as possible for more free test” can backfire — and high-dose cycles already crush SHBG automatically.

Compounds that work this pathway

  • Mesterolone / “Proviron” (DHT) — its main job, per Steve, is exactly this: it binds and lowers SHBG, freeing up more free testosterone, without needing an aromatase inhibitor.[^5] A small, targeted lever — not a mass-builder.
  • Drostanolone / “Masteron” (DHT) — also binds SHBG (and blunts estrogen-mediated effects), doubling as a cosmetic “hardening” compound on a cut.[^5]

Both are DHT-family — non-aromatizing and tissue-selective, which is exactly why they’re the SHBG levers. See Part 3.1.

Supplement & protocol support (science-backed)

If the goal is keeping SHBG in a healthy window rather than crushing it:

  • Boron, ~10 mg/day — the standout. A small human study found ~10 mg/day reduced SHBG and raised free testosterone (and free estradiol) within a week.[^8] Cheap, well-tolerated, and the single most evidence-backed OTC SHBG nudge.
  • Magnesium, ~200–400 mg/day elemental — modestly lowers SHBG binding and supports free testosterone, especially in hard-training, heavy-sweating athletes.[^8]
  • Protocol — don’t chronically under-eat. Very low energy availability raises SHBG. Sometimes the fix is eating enough, not a supplement. Confirm against the hormone panel — SHBG is flagged there for exactly this reason.

Pathway 3 — The Estrogen Receptor (ER)

Estrogen is not just a side-effect to be suppressed — it has moderate, independent anabolic effects of its own, acting through the Estrogen Receptor Alpha and Beta subtypes. It also supports joint health, bone density, libido, and (per Part 2) your lipid profile.[^3] Over-suppressing estrogen with Aromatase Inhibitors (AIs) kills this pathway — and tanks several health markers at the same time. This is one of the most common newbie mistakes, also flagged by Derek: unnecessary AI use that limits fat loss and muscle accrual while wrecking the lipid panel.[^2]

Compounds that touch this pathway

The tools here manage estrogen rather than add anabolism — the anabolism comes from keeping E2 in range, not from these drugs:[^5]

  • Aromatase inhibitors (anastrozole, exemestane, letrozole, arimistane) (ancillaries, not in the steroid family tree) — control aromatase activity and serum estrogen while running aromatizing AAS. Use the minimum that works. Exemestane is often preferred when other AIs are dragging lipids down at higher AAS doses.[^5]
  • SERMs (tamoxifen, raloxifene) (ancillaries) — block estrogen at breast tissue to prevent or treat gyno without lowering systemic estrogen everywhere; tamoxifen also has a PCT role.[^5]
  • Drostanolone / Stanozolol (DHT) — reduce estrogen-mediated gene transcription and water retention for a drier look on a cut (a cosmetic use, not an anabolic one).[^5] The non-aromatizing DHT family is the natural fit for lowering estrogenic load.

The job of this pathway is restraint: keep estrogen in range, reach for AIs sparingly, and never confuse “dry” with “anabolic.”

Supplement & protocol support (science-backed)

  • Injection frequency first. As in Pathway 1, smaller and more frequent doses smooth aromatisation, so you may need little or no AI at all.[^1]
  • Ecdysteroids / Turkesterone — plant compounds proposed to act through the estrogen-beta receptor; a small RCT in resistance-trained men found ecdysterone improved muscle gains, though the mechanism is unsettled and supplement quality varies wildly.[^4]
  • Omega-3 (EPA/DHA), 2–4 g/day plus broader lipid support — because the whole reason not to crush estrogen is partly cardiovascular (detailed in Part 4).
  • Track E2 on ongoing and mid-cycle bloods; the target is “controlled and in range,” not “as low as possible.”

The AI trap

Crashing estrogen feels productive — less bloat, less gyno worry — but flat estradiol brings joint pain, dead libido, low mood, brittle lipids, and a blunted anabolic response. The fix is almost always injection frequency, not more AI.

Pathway 4 — The Progesterone Receptor (PR)

Progesterone-receptor stimulation contributes its own unique anabolic benefit. This is part of why the 19-nor derivatives — Nandrolone (Deca), Trenbolone, MENT — feel so exceptionally potent: they hit the PR pathway hard on top of the androgen receptor.[^1]

But you do not need harsh 19-nors to get the PR benefit — and the 19-nors come with a serious tax: heavy progesterone-receptor activity raises prolactin, which crushes libido and causes its own cluster of side effects.

Compounds that work this pathway

  • Nandrolone & Trenbolone (19-nors) — hit the progesterone receptor hard alongside the AR, which is part of why they feel so potent. Nandrolone’s standout secondary job is joint and connective-tissue lubrication in the offseason; trenbolone’s is anabolism/recovery/fat-loss in a deficit. Both raise prolactin.[^5]
  • Pregnenolone — the upstream precursor; supports the pathway gently and improves cognition and sense of well-being on cycle when neurosteroid production downregulates.[^5]
  • Dopamine agonists (cabergoline, bromocriptine, pramipexole) — the brake, not the gas: they control the prolactin that heavy 19-nors raise.[^5] Cabergoline is effective but potent — a Part 4 / physician topic, and itself a strong argument for simply not over-running 19-nors.

Supplement & protocol support (science-backed)

To exhaust the PR pathway without the prolactin tax:

  • HCG / HMG on cycle maintains baseline progesterone and testicular function (also a fertility play — Part 2).
  • Vitamin B6 (P5P), ~50–200 mg/day meaningfully lowers prolactin — it’s used clinically for exactly that — making it the first-line OTC prolactin nudge before any dopamine agonist.[^14]
  • Vitamin E and adequate zinc modestly help keep prolactin in check.
  • Low-dose sublingual micronized progesterone to maintain baseline without 19-nors, per Steve.[^1]

Watch prolactin on 19-nors

If your protocol does include nandrolone or trenbolone, prolactin moves onto your monitoring list (Part 2), and prolactin management belongs in Part 4. Over-activating PR is the textbook example of “more is worse.”

Pathways 5 & 6 — Glucocorticoid & Mineralocorticoid (cortisol blocking)

These two pathways are different in kind. They don’t build muscle up — they stop muscle from breaking down. Cortisol is a glucocorticoid that binds its receptor and drives muscle wasting, especially in a calorie deficit. Certain compounds act as antagonists, blocking cortisol from binding and thereby protecting lean mass. This is the anti-catabolic mechanism referenced back in Part 1.

Compounds that work these pathways

  • Trenbolone (19) — high glucocorticoid-receptor affinity makes it powerfully anti-catabolic in a deficit; cap at ~8 weeks for side-effect reasons.[^1][^5] The 19-nor family is the home of cortisol blocking.
  • Halotestin (T → acts DHT-like) / Oxandrolone (DHT) / Stanozolol (DHT) — used late in contest prep for hardness, strength, and (Anavar’s secondary job) mind-muscle connection and collagen support for joints.[^5] Harsh and liver-toxic; short, specific windows only.

Supplement & protocol support (the safer anti-catabolic levers)

You can blunt cortisol meaningfully without harsh compounds:

  • Ashwagandha (KSM-66), ~300–600 mg/day — repeatedly shown to lower cortisol, and in trained men to modestly improve strength and recovery.[^9]
  • Phosphatidylserine, ~400–600 mg/day around training blunts the exercise-in

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