Top 10 natural testosterone boosters for men over 40

These aren't based on gym-floor hype. They're the things with real research behind them. 

And before we get into the list, it's worth saying: not every one of these top 10 testosterone boosters will fit your routine, and that's fine.

Pick what's realistic for you, and build from there.

The top 10 testosterone boosters for men over 40

1. Zinc

• Zinc plays a direct role in testosterone production. 

• When levels run low, so does the function of the cells in your body that make testosterone. ^[2] 

• Men over 40 are especially prone to falling short because zinc gets depleted through sweat. 

• So if you exercise regularly, you may be the first to feel the gap.

2. Vitamin D

• Low vitamin D has been linked to lower testosterone, especially in northern climates during the winter months. 

• Most people are short on it without knowing. 

• The evidence isn't definitive, ^[3] but it's consistent enough that checking your vitamin D levels is a reasonable first step.

3. Magnesium

• Magnesium is tied to how much free testosterone your body actually has available to use. 

• In a four-week study, men who supplemented with magnesium saw real increases in both free and total testosterone. 

• The effect was bigger in men who also exercised. ^[4] 

• Magnesium also helps with sleep quality, which makes it one of the better dual-purpose options on this list.

4. Ashwagandha

• Ashwagandha works mainly through stress. 

• It helps bring down cortisol (your body's primary stress hormone), and cortisol competes directly with testosterone. 

• Less stress hormone running the show means more room for testosterone to do its job. 

• In a 16-week trial involving men aged 40 to 70, ashwagandha produced a 14.7% greater increase in testosterone compared to placebo. ^[5]

5. Tongkat ali

• Tongkat ali (also called Eurycoma longifolia) has one of the more solid research track records for natural testosterone support. 

• A systematic review and meta-analysis found it supports testosterone production, especially in men whose levels are already on the lower end. ^[6] 

• The effect is real but gradual. Don't expect overnight results.

6. Fenugreek

• Fenugreek is one of the better-researched natural options specifically for testosterone. 

• In an 8-week double-blind trial involving 88 men, those taking fenugreek extract saw significant increases in both total and free testosterone compared to placebo, along with improved erectile function scores. ^[7]

• It's a common ingredient in men's health supplements, and the research backs up why. 

7. Resistance training

• Lifting weights is one of the most reliable things you can do. 

• It creates a real spike in testosterone during and right after a workout. ^[8] 

• And you don't need a crazy routine. Consistency a few times a week gives you most of the benefit.

8. Quality sleep

• Most of your testosterone is produced during deep sleep. 

• When you cut sleep short, you cut testosterone too. Less sleep consistently lowers testosterone at morning, afternoon, and 24-hour measurement points. ^[9] 

• If you're running on 5 or 6 hours most nights, fixing your sleep might be the single biggest lever on this whole list.

9. Cutting back on alcohol

• Heavy, chronic alcohol use is directly linked to lower testosterone. ^[10] 

• The key word is heavy. 

• Light or moderate drinking doesn't carry the same risk. 

• But if regular drinking is a big part of your week, it's worth knowing it works against you.

10. Stress management

• Chronic stress keeps cortisol high, and cortisol competes with testosterone. 

• Simple things actually help here: regular walks, taking a real lunch break, spending time outside. 

• They're not dramatic fixes. But over time, they change what your nervous system defaults to.

Takeaway: The strongest natural levers for testosterone aren't exotic. They're sleep, stress, and a handful of well-researched nutrients and habits. 

Why one formula can beat five separate bottles

A lot of the ingredients above show up together in Sens Labo's Formula for Men. 

It's built around Pacific Oyster extract, one of the most concentrated natural sources of zinc available, and fenugreek, ^[7] which has its own research showing significant testosterone improvements in men. 

If you’re looking for support, Formula for Men is a clear, practical place to start.

Takeaway: Formula for Men pulls several of the natural ingredients on this list into one certified, Canadian-made formula.

The bottom line

Naturally increasing your testosterone levels isn't about chasing a sudden overnight boost in energy, especially with natural ingredients. 

It's about giving your body the support it's been missing for a while.

Testosterone declines gradually, and it responds to support gradually too. 

Frequently asked questions

Do I need to take/do all 10 of these things?

• No. Start with one or two that fit your life and give them a few weeks.

• Adding too many changes at once makes it hard to know what's actually helping.

How long does natural testosterone support take to work?

• Most people notice a change in two to four weeks.

• The shift is gradual, not sudden. Consistent daily use matters more than the dose.

Is Formula for Men safe to take with other medications?

• Formula for Men notes potential interactions with antidepressants, anticoagulants, digoxin, and medications for diabetes or blood pressure.

• If you take any of those, check with your doctor first.

Do any of these require a prescription?

• No. Everything on this list is available without a prescription.

• And Formula for Men is a licensed Natural Health Product, not a pharmaceutical.

References

[1]. Testosterone, aging, and the mind — Harvard Health. Confirms testosterone declines gradually in men, averaging just over 1% per year after midlife.

[2]. Zinc and testosterone production — National Library of Medicine. Confirms zinc deficiency disrupts the function of testosterone-producing cells in men.

[3]. Vitamin D and testosterone in adult men — PubMed. Systematic review showing heterogeneous, inconclusive evidence on vitamin D and testosterone levels in men.

[4]. Magnesium supplementation and testosterone — PubMed (Cinar et al.). Confirms four-week magnesium supplementation increased free and total testosterone in both sedentary men and athletes.

[5]. Ashwagandha and testosterone in men aged 40-70 — PubMed (Lopresti et al.). RCT showing ashwagandha produced a 14.7% greater testosterone increase versus placebo over 16 weeks.

[6]. Tongkat ali and testosterone — National Library of Medicine. Systematic review and meta-analysis confirming tongkat ali supports testosterone production, particularly in men with low baseline levels.

[7]. Fenugreek and testosterone in men with testosterone deficiency — National Library of Medicine (Kim et al.). Double-blind RCT confirming fenugreek extract produced significant increases in total and free testosterone and improved erectile function versus placebo in 88 men over 8 weeks.

[8]. Resistance training and testosterone — PubMed. Confirms resistance training produces an acute testosterone spike during exercise but no lasting change in resting levels over time.

[9]. Sleep restriction and testosterone — National Library of Medicine. Review confirming reduced sleep consistently lowers testosterone at morning, afternoon, and 24-hour measurement points.

[10]. Alcohol and male reproductive hormones — National Library of Medicine. 2025 meta-analysis confirming heavy, chronic alcohol use is linked to testosterone decline in men.