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Testosterone Supplements: The Best Natural Ones (and What to Avoid)
Are you looking for testosterone supplements because you feel less energetic, have lost muscle, don't recover like before, or want to support libido and vitality after 40? Before buying the first booster, you should know one thing: most "testosterone boosters" don't work. The Morgado 2023 systematic review (International Journal of Impotence Research) analysed 52 studies on 27 plant principles and concluded that only a handful have plausible evidence — while some of the best-selling ones (tribulus first) have no real effect on testosterone.
In this guide we separate the wheat from the chaff. We see which supplements have robust RCTs (Fenugreek, Ashwagandha, vitamin D, zinc, magnesium), which work only in specific conditions (micronutrient deficits), which do nothing (tribulus alone) and which to avoid. With dosages, mechanisms and interactions. The aim is to help you spend your money well.
What really works: supplements with clinical evidence
Foreword: what the studies really measure
Important context: not all studies measure the same thing. Some measure only total testosterone (which is largely bound to SHBG), others free testosterone (the biologically active fraction), others sexual function markers (IIEF, DISF scales). Increasing total testosterone by 10% isn't the same as a 10% symptom improvement. The studies we cite are randomised controlled trials (RCTs) with placebo, published in peer-review journals, with standardised extracts at uniform dose.
Fenugreek — the most solid
Fenugreek (Trigonella foenum-graecum) is the supplement with the strongest testosterone evidence. The Wankhede 2016 study (PMID 30356905) with standardised extract Fenu-FG 600 mg/day for 8 weeks showed significant increase in total testosterone and free testosterone, reduction in body fat and improved strength. Mechanism probably linked to aromatase inhibition (reduces testosterone→estrogen conversion) and SHBG modulation.
Effective dose: 500-600 mg/day of extract standardised in furostanolic saponins. Cycles of 8-12 weeks. Contraindications: few side effects; caution with anticoagulant therapy.
Ashwagandha — adaptogen with documented hormonal effect
Ashwagandha (Withania somnifera) is the only adaptogen with specific testosterone RCTs. The Lopresti 2019 study (PMID 30854916) on men 40-70 with standardised extract Shoden 240 mg/day for 8 weeks showed +14.7% total testosterone and +18% DHEA-S, with improvement in general well-being and cortisol reduction. Particularly effective when stress is part of the picture.
Effective dose: 240-600 mg/day of standardised extract (KSM-66 or Shoden). Minimum cycles 8 weeks. Contraindications: autoimmune diseases (immunostimulant), pregnancy, hyperthyroidism.
Vitamin D — only if deficient
Vitamin D works on testosterone, but only if you're deficient (25-OH vit D < 30 ng/mL). The Pilz 2011 study (PMID 21154195) with 3,332 IU/day for 1 year showed +25% total testosterone in men with initial deficiency. If you're already at normal levels, further supplementation doesn't increase testosterone. Dosing vitamin D in blood is the first step before supplementing.
Dose: 2,000-4,000 IU/day for 3 months. Most Italians over 50 are deficient.
Zinc — useful in marginal deficit
Zinc is an essential cofactor of testosterone synthesis. The Prasad 1996 study (PMID 8875519) showed that 30 mg/day for 6 months in elderly men with marginal deficit doubles testosterone. But as with vitamin D, effect is maximal in deficit; in subjects with adequate zinc the effect is modest.
Dose: 15-30 mg/day. Caution with doses > 40 mg/day for long periods (copper interference).
Magnesium — indirect support
Magnesium doesn't increase testosterone directly but increases the bioavailable share: reduces testosterone-SHBG binding. Athlete studies show +25% free testosterone with supplementation. Magnesium is also fundamental for sleep (where most testosterone is produced) and stress management.
Dose: 300-450 mg/day, preferably in bisglycinate form for maximum bioavailability.
What does NOT work (or works little)
Tribulus terrestris — alone or as booster
Despite aggressive marketing, Morgado 2023 classified tribulus as "NOT effective" for testosterone increase. Most RCTs found no significant hormone increase. Tribulus has instead documented effects on libido and sexual function, but through non-androgenic mechanisms (probably nitric oxide and central receptors). If you seek it for testosterone, you seek the wrong thing; if you seek it for libido/erection, it has its role.
DAA (D-Aspartic Acid)
Some initial studies showed transient testosterone increase. Subsequent more rigorous studies didn't confirm: the effect wears off in 2-3 weeks, and in athletes has no significant effect. Not recommended.
Commercial "proprietary blend" boosters
Most commercial products combine 10-20 principles in sub-therapeutic doses. They have no evidence. Better to invest in 2-3 high-dose principles (fenugreek, ashwagandha, vitamin D).
DHEA
DHEA is a pro-hormone that actually increases testosterone, but with significant side effects (acne, aggression, gynecomastia from aromatization). Not an innocuous supplement. In Italy it's a prescription drug.
How to increase testosterone naturally: before supplements, lifestyle
Before any supplement, four things have greater impact on testosterone than any capsule:
- Sleep 7-9 hours/night: testosterone production mostly during REM sleep. Sleeping 5 instead of 8 hours reduces testosterone by 10-15% in a week
- Resistance training: weights 3-4 times/week acutely increase testosterone and GH. Chronic effects documented with +15% after 12 weeks
- Weight loss: if you have excess abdominal fat, reducing waist circumference by 5-10 cm increases testosterone by 20-30%. Obesity is the first modifiable cause of male hypogonadism
- Stress management: chronically elevated cortisol suppresses testosterone. Meditation, breathing, sleep.
Only after optimising lifestyle do supplements become the "additional 20%" to bring testosterone toward your genetic maximum.
Foods that increase (or reduce) testosterone
Testosterone-supporting foods:
- Eggs (cholesterol for steroidogenesis and vitamin D from the yolk)
- Fatty fish (salmon, sardines, mackerel): omega-3 and vitamin D source
- Lean meat: high-quality proteins, iron and zinc
- Nuts (almonds, walnuts, pumpkin seeds): magnesium, zinc, good fats
- Legumes (lentils, chickpeas): plant zinc and magnesium
- Cruciferous vegetables (broccoli, cauliflower, cabbage): rich in indole-3-carbinol which inhibits aromatase
- Oysters: absolute zinc record (30-40 mg per 100 g)
- Extra virgin olive oil: polyphenols and monounsaturated fats support steroid synthesis
Testosterone-reducing foods:
- Excess alcohol (>2 units/day): direct suppression of testicular steroidogenesis
- Simple sugars and ultra-processed foods: insulin resistance increase
- Trans fats and fried foods
- Soy in large quantities (>50 g/day of concentrated isoflavones)
- Licorice and licorice root candy: contains glycyrrhizin which reduces testosterone by 25-50% with daily consumption
- Chronic calorie restriction: extreme diets reduce steroidogenesis
When to talk to the doctor: red flags and hypogonadism
Not every libido/energy drop is "andropause" or low testosterone. But if you have 3 or more of these symptoms present for months, dosing morning testosterone makes sense:
- Persistent reduction of sexual desire
- Reduction of spontaneous morning erections
- New-onset erectile dysfunction
- Loss of muscle mass and strength
- Increase in abdominal fat despite unchanged diet
- Persistent fatigue
- Low mood
If total testosterone is < 300 ng/dL (12 nmol/L) in two morning measurements, you have hypogonadism. TRT is evaluated when lifestyle and supplements don't give results in 3-6 months.
Additional elements: overweight, diabetes and the role of belly fat
Visceral abdominal fat is an active endocrine organ that suppresses testosterone through multiple mechanisms: it contains high concentrations of aromatase, the enzyme that converts testosterone to estradiol; it promotes systemic inflammation which inhibits the hypothalamic axis; it reduces insulin sensitivity which in turn reduces testosterone production. Studies show that in obese men, weight reduction of 10-15% can increase testosterone levels by 20-30% without any supplementation. This is the single greatest lever in most men over 40 with low testosterone.
The RedMoringa protocol for testosterone: INCA FORCE + supports
INCA FORCE is the RedMoringa formula combining synergistically the most evidence-based principles for male vitality:
- Black maca extract 100:1: acts on libido and energy without direct testosterone modification
- Tribulus terrestris standardised to 90% saponins: support for sexual function
- Organic Moringa oleifera: provides zinc and other micronutrients fundamental for steroidogenesis
INCA FORCE is to be understood as a formula for libido, energy and vitality, not as a "testosterone booster". For an action more focused on testosterone, ideal combination: INCA FORCE + zinc + vitamin D (if deficient) + magnesium. For gym training the Energy Supplement with Tribulus and Maca, for a more complete protocol the Energy Boost Treatment. The Magnesium Bisglycinate + D3 + B6 covers magnesium and vitamin D in a single formula.
FAQ — Testosterone supplements
Which supplement increases testosterone most?
In order of clinical evidence: fenugreek (Wankhede 2016), ashwagandha (Lopresti 2019, +14.7%), vitamin D (Pilz 2011, +25% if deficient), zinc (Prasad 1996, doubles in marginal deficit). Tribulus does NOT increase testosterone per Morgado 2023.
Does fenugreek really work?
Yes, it has the best clinical evidence. Effective dose: 500-600 mg/day standardised extract for at least 8 weeks. Look for products standardised in furostanolic saponins.
How long to increase testosterone naturally?
With optimised lifestyle + supplements, first subjective effects in 3-4 weeks. Measurable hormonal changes in 8-12 weeks. Significant changes can increase testosterone by 15-30% in 3-6 months.
Do testosterone supplements have side effects?
Validated principles have good safety profile at therapeutic doses. Possible side effects: minor gastrointestinal (ashwagandha), anticoagulant interaction (fenugreek), vitamin D overdose > 4,000 IU/day for years, zinc-copper imbalance for years > 40 mg/day. DHEA is instead a pro-hormone with significant side effects.
Does tribulus increase testosterone?
No, per Morgado 2023 systematic review (52 studies). Tribulus may improve libido and erectile function through non-hormonal mechanisms, but doesn't increase measurable testosterone values.
Better a commercial booster or single supplements?
Better single supplements at full dose. Commercial "proprietary blend" contain 10-20 principles in sub-therapeutic doses. Better invest in 2-3 principles with clinical evidence at study doses.
INCA FORCE — Black Maca + Tribulus + Moringa
The formula for libido, energy and vitality: clinically proven active ingredients, targeted dosages, no illusory booster promises.
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