I spend my own money testing longevity products — then I tell you the truth, including when to skip them.
I’m Parker. I’m not a brand, a doctor, or a dropshipper with a discount code. I’m one person who got tired of paying premium prices for longevity products that quietly underdelivered — so I started testing them properly, for months, with my own money, and writing down what actually held up.
No hype. No countdown timers. No “everything is amazing.” Just honest reviews that tell you when something’s worth it — and, just as often, when it isn’t and you should buy something cheaper instead.
Start here — my latest reviews
Supplements
- Momentum Longevity Shake Review: 4 Months In, Honestly — what I noticed, the taste, the real monthly cost, and who should skip it.
- The Best AG1 Alternative if You Want More Than Just Greens — why most “AG1 alternative” lists are wrong, and the honest budget options first.
- IM8 vs Momentum: The $183 Beckham Shake vs the $150 One — what the celebrity markup actually buys you.
Devices & Wearables
- Resona Vibe Review: 60 Days with a Pocket PEMF Device — what PEMF actually did (and didn’t do) after two months of daily testing.
- What Is PEMF Therapy? A Skeptic’s Guide — what the research actually shows, how it works, and what 60 days of daily use felt like.
- Does PEMF Therapy Actually Work? — the research honestly reviewed, and 60 days of personal results.
- PEMF Therapy for Sleep: 30-Day Protocol and What Actually Happened — I tracked sleep onset, wake-ups, and morning alertness week by week. Here’s what changed.
- Resona Vibe vs HigherDOSE PEMF Mat — the $1,012 price difference explained, and who should buy which.
- Best Portable PEMF Device for Home Use (2026) — honest ranking from someone who’s used the top pick for 60 days. No Healthline-style lists.
Cold Plunge
The cold plunge market has exploded with options across every price point. I’ve dug through hundreds of verified buyer reviews, tested the published research, and compared the leading units head-to-head so the decision is straightforward when you’re ready to buy.
- How Long Should You Stay in a Cold Plunge? — what the research says, what the Soberg 11-minute protocol actually means in practice, and the goal-based duration breakdown.
- Cold Plunge Beginner Guide — first-session prep, breathing technique, temperature guide, and the 8-week progression from 30 seconds to a daily habit.
- Cold Plunge and Sleep: What the Data Shows — whether cold plunging helps or hurts sleep, and why timing matters more than duration.
Plunge is the consensus pick across review forums and long-term buyer reports. Use code ZECHARIAH16537 at checkout.
Why trust a guy with affiliate links?
Fair question. Tested Longevity is reader-supported: some links here are affiliate links, and I earn a commission if you buy through them — at no extra cost to you. That’s the whole business model, and I tell you up front on every page.
But here’s the part that matters: every recommendation on this site is backed by either months of personal use or thorough research across verified buyer reports, peer-reviewed studies, and head-to-head comparisons — and I’ll tell you which is which. A supplement brand tells you their product is the best. A device company says theirs will change your life. I’ll tell you when they’re wrong. That’s the difference, and it’s the only kind of “trust me” I think is worth anything: honest standards, in public, with a name on it.