Men over 40 deserve a straight answer in a category that mostly gives them hype. I've been in this industry since 2015. In that time I've watched the claims get bolder, the marketing get louder, and men get misled. Here's my honest assessment of where things stand, and what to actually look for before you spend a dollar on anything in this space.

The category earns the scepticism. That doesn't mean every product in it is the same.

 

What's actually happening in the body after 40

Men's testosterone levels do decline with age, around 1 to 2 percent per year after 35. That's not a crisis. It's biology. And for most men, the issue isn't simply how much testosterone the body produces; it's how much is biologically available. This distinction matters more than most men realise, and it's one most supplement marketing never addresses honestly.

 

Free testosterone vs total testosterone: the gap your GP may not mention

When a doctor runs a standard blood test and says your testosterone is 'normal', they're usually measuring total testosterone. But total testosterone doesn't tell the full story.

 

A protein called SHBG (sex hormone-binding globulin) increases as men age. SHBG binds to testosterone during transport, making it unavailable to the cells that need it. A man can have 'normal' total testosterone and still have low free testosterone, which is the fraction that actually does the work.

 

This is why some men over 40 notice the classic signs: flat energy, reduced drive, slower recovery, even when their blood test looks fine. It's not always a production problem. Sometimes it's a bioavailability problem. And that distinction matters when you're evaluating anything in this category.

 

Two very different things get called testosterone supplements

This is where the category earns its scepticism.

 

The first type is testosterone replacement therapy, or TRT. This is a prescription medication, administered by a doctor, that adds exogenous testosterone to your system. It's a medical intervention. It works for the men who genuinely need it. It also comes with real considerations: long-term dependency on external testosterone, effects on natural production, fertility considerations, and the need for ongoing monitoring. This is not a supplement. It's not available over the counter. Men using it are, or should be, under medical supervision.

 

The second type is what you'll find on a supplement shelf or in a social media ad. This ranges from genuinely evidence-backed natural formulations to products that are little more than underdosed ingredients in a well-designed bottle. The gap between the best and worst in this category is enormous.

 

The man who did his research and the man who got swept up in online hype are both buying supplements. They're not buying the same thing.

 

What separates a credible product from one built on marketing

If you decide to try a natural men's vitality supplement, here's what I'd look for:

 

Every ingredient dose is shown. Not hidden behind 'proprietary blend' language. If a company won't show you exactly how much of each ingredient is in the capsule, that's the answer. Proprietary blends exist to hide underdosing.

 

The doses are meaningful. Where clinical research exists, the dose matters enormously. Fenugreek at 600mg standardised to 50% saponins is the dose used in a 12-week double-blind randomised controlled trial on 120 men. That level of specificity is the difference between a formula built on evidence and one built on a marketing label.

 

A named formulator. Who decided which ingredients to include, at what doses, in what form? If the answer is anonymous, that tells you something about what's driving the decisions.

 

Realistic expectations. Any supplement promising dramatic results in days is not being straight with you. Natural support works with your body over weeks and months. The men who see the most from TESTO are the ones who commit to 90 days and beyond.

 

A genuine guarantee. Not '30 days, unopened bottles only.' A real 90-day, full or empty bottle, no-questions guarantee means the company actually believes in what they've made.

 

A founder who stands behind it publicly. Not a faceless brand with an anonymous website. A real person, named, who has used the product themselves and is willing to say so openly. If you can't find out who built the formula, who formulated it, and why, that tells you something about the confidence behind it.

 

I'm Ian Gleghorn, founder of TESTO New Zealand.

 

TESTO was formulated by Jenni Lane, a New Zealand naturopath and natural health specialist with over 20 years of experience. It has 7 ingredients. Every dose is on the label. It's been reviewed by a Medsafe compliance specialist. Over 10 years of NZ men reordering says more than any claim I could make, not dramatically, not overnight, but consistently for the men who stay with it.

 

If you're unsure, don't buy anything yet. We've written a free guide specifically for NZ men over 40 that explains what's actually happening in the body, what the research shows, and what realistic expectations look like. No gate, no pressure. Just honest information.

 

If you decide TESTO is right for you after reading it, you can try it risk-free for 90 days. Full refund if it's not right. No forms, no questions.

Ian Gleghorn

Founder, TESTO New Zealand

 

Read the free guide first Written for NZ men over 40. Enter your email and we'll send it straight to you. Get the free guide