Total testosterone in men has been declining at approximately 1–2% per year after age 30, with population-level studies showing men today have significantly lower testosterone than men of the same age in previous decades. The drivers are multifactorial: chronic stress, sleep deprivation, excess body fat, endocrine disruptors (BPA, phthalates), sedentary lifestyle, and nutritional deficiencies.
Standard lab ranges run from 300 to 1,000 ng/dL, but optimal functional levels for men are typically 600–900 ng/dL. Many men in the "normal" range at 350 ng/dL still experience symptoms of low testosterone: fatigue, low libido, poor recovery, brain fog, and loss of muscle mass.
| Dose | Timing | Form |
|---|---|---|
| 200–400 mg | Morning with or without food | LJ100 standardized extract (100:1 minimum) |
Multiple randomized controlled trials in both deficient and healthy men show consistent total testosterone increases (15–37% in some studies), with accompanying improvements in libido, energy, and stress resilience. It works via two mechanisms: inhibiting SHBG — which "traps" testosterone — and normalizing HPA axis function to reduce cortisol's testosterone-suppressing effects.
Look for: LJ100 extract or standardized 200:1 water-soluble extract. The cheap 50:1 powder found in most supplements is not the same as LJ100.
| Dose | Timing | Cycling |
|---|---|---|
| 425–600 mg | Morning | 8 weeks on / 4 weeks off — monitor LFTs |
Fadogia works by directly stimulating Leydig cells via steroidal saponin compounds. Important safety note: High doses in animal studies showed signs of testicular toxicity. Cycle it and get liver function tests periodically. Do not exceed 600mg/day. Avoid if you have any liver condition.
| Dose | Timing | Form |
|---|---|---|
| 10–12 mg | Morning with food | Boron citrate or calcium fructoborate |
A 2011 clinical trial showed 10mg of boron daily for one week significantly reduced SHBG by ~28% and increased free testosterone by ~28%. Boron also increases vitamin D conversion efficiency and reduces estradiol — a triple-action supplement for hormonal optimization.
| Dose | Timing | Form |
|---|---|---|
| 25–40 mg | Evening, away from iron | Bisglycinate or picolinate (best absorption) |
Zinc deficiency directly reduces testosterone — it is required as a cofactor for over 300 enzymatic reactions including testosterone synthesis. Zinc also inhibits aromatase, the enzyme that converts testosterone to estrogen.
Copper balance: High-dose zinc (>50mg/day) depletes copper. At 25–40mg, include 1–2mg copper bisglycinate daily.
| Dose | Timing | Stack With |
|---|---|---|
| 5,000–10,000 IU D3 | Morning with fat | Vitamin K2 MK-7 (100–200mcg) + Magnesium |
Vitamin D receptors (VDRs) are found on Leydig cells, where testosterone is produced. A 2011 RCT found men supplementing 3,332 IU/day for one year had significantly higher testosterone than the placebo group. Target optimal range: 50–80 ng/mL.
| Dose | Timing | Form |
|---|---|---|
| 300–600 mg | Evening or AM/PM split | KSM-66 or Sensoril (standardized withanolides) |
The landmark 2019 KSM-66 study showed a 27.9% reduction in cortisol and significant increases in testosterone in men under chronic stress. For stressed, over-trained, or sleep-deprived men, Ashwagandha may be the single highest-impact testosterone intervention.
| Supplement | Dose | Timing | Mechanism |
|---|---|---|---|
| Tongkat Ali LJ100 | 300 mg | Morning | SHBG inhibition, HPA normalization |
| Fadogia Agrestis | 425 mg | Morning | Leydig cell stimulation, LH increase |
| Boron Citrate | 12 mg | Morning with food | SHBG suppression, free testosterone increase |
| Vitamin D3 | 5,000 IU | Morning with fat | VDR activation in Leydig cells |
| Vitamin K2 MK-7 | 150 mcg | Morning with fat | Calcium direction, D3 synergy |
| Zinc Bisglycinate | 30 mg | Evening | Aromatase inhibition, androgen cofactor |
| Copper Bisglycinate | 2 mg | Evening | Zinc-copper balance |
| Ashwagandha KSM-66 | 600 mg | Evening or split AM/PM | Cortisol reduction, HPA normalization |
| Magnesium Glycinate | 400 mg | Evening | Sleep quality, cofactor for D3, aromatase reduction |
| Biomarker | Optimal Range (Male) | Why It Matters |
|---|---|---|
| Total Testosterone | 600–900 ng/dL | Primary outcome measure |
| Free Testosterone | 15–25 pg/mL | The bioavailable, active form |
| SHBG | 20–40 nmol/L | Lower = more free testosterone available |
| Estradiol (E2) | 20–30 pg/mL | Too high = aromatization issue; too low = joints/mood |
| LH + FSH | Within range | Assess hypothalamic-pituitary axis function |
| Vitamin D | 50–80 ng/mL | Confirm D3 supplementation is achieving optimal levels |
| Zinc (serum) | 80–120 mcg/dL | Confirm zinc repletion |
| LFTs (ALT, AST) | Within range | Required if using Fadogia Agrestis |
Most users report subjective improvements in energy, libido, and mood within 2–4 weeks. Measurable increases in bloodwork typically appear at the 6–12 week mark. Run the full protocol for 90 days before reassessing.
Most of these supplements are compatible with TRT. Always consult your prescribing physician before adding supplements to a TRT protocol — some compounds may affect how your doctor interprets your labs.
Ashwagandha, Vitamin D3, and Zinc are well-studied in women. Tongkat Ali has limited female data. Fadogia Agrestis has essentially no female clinical data and is not recommended for women at this time.
Total testosterone measures all testosterone in blood — but most is bound to SHBG and albumin, making it biologically inactive. Free testosterone is the unbound fraction that can activate androgen receptors. Both Tongkat Ali and Boron specifically target SHBG to increase the free fraction.
Log your testosterone bloodwork, track your supplement stack, and let the Health Intelligence Advisor personalize your protocol.
Join the Waitlist →