What this world covers
Hormones are the endocrine signaling molecules that control metabolism, growth, mood, sleep, sexuality and stress response. This world bundles the hormone systems where lifestyle interventions, micronutrients and targeted substances measurably work — before hormone replacement therapy comes into play.
Focus is on eight central axes: testosterone (hypogonadism, andropause), cortisol (HPA axis, chronic stress), thyroid (T4/T3/rT3, Hashimoto), insulin (insulin resistance, prediabetes), estrogen and progesterone (cycle, peri-/postmenopause), DHEA (adrenal cortex) and GH and IGF-1 (growth axis).
Why the order matters
The most common expensive error in hormonal self-optimization: substituting too early. Anyone reaching for TRT at 35 without first addressing sleep, strength training, vitamin D, zinc and stress management is masking symptoms while suppressing endogenous production via negative feedback. After discontinuation, baseline is worse than before.
Pragmatically: 80 % of suboptimal hormone values in people under 50 are correctable via sleep, strength training, micronutrients and stress reduction — given 8–12 weeks of consistency. Only after that: targeted micronutrient substitution, adaptogens, phytoestrogens. TRT, HRT, thyroid hormones always under medical supervision and with validated indication.
The most important levers
Testosterone
Total and free T decline physiologically after 30 at 1–2 % per year — but modern adults age here two to three times faster than their grandparents, primarily through obesity, sleep deprivation and lack of movement. Before TRT is discussed, four reproducible levers:
- Strength training 3×/week, heavy multi-joint lifts → +15–20 %
- Sleep ≥ 7 h → +15 %
- Vitamin D to > 30 ng/ml → +20–25 % when deficient
- Body fat < 20 % (men) → +25–40 % in overweight men
Only when these four levers are running and total T at two morning measurements stays < 350 ng/dl is TRT a medical conversation.
Cortisol
Chronically elevated cortisol is one of the most underrated factors in abdominal fat, insulin resistance, sleep disorders and accelerated aging. The HPA axis responds primarily to sleep and training dose — not to substances.
Strongest evidence:
- Sleep extension to ≥ 7 h: lowers cortisol awakening response 20–30 %
- Meditation 20 min/day: lowers cortisol AUC ~25 % (meta-analysis, n=44)
- Strength training 2–3×/week: normalizes HPA reactivity
- Phosphatidylserine 400–600 mg: blunts acute cortisol spikes 30–40 %
- Ashwagandha 600 mg KSM-66: reduces cortisol 20–30 % in RCTs
Thyroid
Subclinical hypothyroidism is more common than most think — and often caused by micronutrient gaps. The thyroid produces T4 → needs iodine, tyrosine. Conversion T4 → T3 → needs selenium, zinc, iron. Before any L-thyroxine discussion: iodine (urine), selenium (plasma), ferritin (> 70 ng/ml), vitamin D (> 30 ng/ml) checked.
For Hashimoto: TPO and Tg antibodies, selenium 200 µg/day reduces TPO-AB in multiple RCTs, gluten-free diet has heterogeneous evidence but works for a subgroup.
Insulin
Insulin resistance is the precursor to nearly every metabolic disease — and more reversible with lifestyle than any other hormonal dysregulation. Most sensitive early markers: fasting insulin (< 10 µU/ml optimal), HOMA-IR (< 1.5), triglyceride/HDL ratio (< 1.5 excellent).
Top levers:
- Strength training: +25–40 % insulin sensitivity, independent of weight loss
- Time-restricted eating 10–12 h window
- Reducing processed carbohydrates, not carbohydrates generally
- Berberine 500 mg 3×/day: comparable to metformin in head-to-head studies
How we rate evidence
Hormonal endpoints are tricky — blood test values fluctuate with time of day, sleep, stress, meals. We weight:
- Meta-analyses on lifestyle interventions with hard endocrine endpoints
- RCTs ≥ 8 weeks duration with controlled measurement timing
- Blood test correlations in cross-sectional data (hypothesis-generating, not action-guiding)
- Anecdotes and n=1 tracking — flagged, not used as evidence
More importantly: we distinguish between surrogate endpoints (e.g., cortisol lowered) and functional endpoints (e.g., less burnout) — both have value, but not the same kind.
Most common effects and interactions
Endocrine axes interact strongly — single interventions often shift the balance:
- TRT lowers endogenous production via negative feedback — months of recovery after discontinuation.
- High cortisol suppresses testosterone — stress reduction first.
- Thyroid hormones accelerate cortisol clearance — when substituting, consider adrenal function too.
- DHEA partially aromatizes to estrogen — in men check estradiol too.
- Insulin and growth hormone antagonize each other — insulin peaks lower GH secretion.
What does NOT belong in this world
- Hormone-regulating adaptogens like Rhodiola for cognition → World 05 (Cognition)
- GH secretagogues and peptides → World 04 (Peptides)
- Sleep hormones like melatonin as sleep aid → World 08 (Sleep)
- SAMe and saffron for mood → World 09 (Mental)
Vitamin D is hormonally active but belongs primarily in World 01 (Foundation), because its status correction is the most common prerequisite for hormonal optimization.
How Biohacking AI operationalizes this
In this world it's about data-based decisions — not gut feel:
- The Blood Test Tracker imports lab values and compares them to age-adjusted reference ranges, not just the standard range.
- The Studies database filters per hormone axis the lifestyle RCTs before the substitution studies — you see first what you can do yourself.
- The Forum collects experience reports with before/after values and exact protocols — moderated by advisors with endocrinology background.
- The Coach translates your values into prioritized levers and explicitly says when medical guidance is necessary.
The goal is not "more hormones." The goal is: repair your endocrine machine instead of overriding it — and only substitute when everything else is exhausted.