NMN & NAD+Explainer
How your cells repair DNA, and how to keep that up after 25
Your cells repair their DNA with a molecule called NAD+, and your supply starts to drop around 25. In human trials, taking NMN brought it back up.
We read the research on living longer and tell you what it found. Plus what lab tests show is inside the capsules.
SpermidineReport
A 20-year study compared 146 compounds. One had the strongest link to a longer life.
It’s called spermidine. Researchers followed 829 people for 20 years, and the more of it they got from their food, the lower their risk of dying.
SulforaphaneExplainer
The most studied molecule in longevity comes from broccoli
Sulforaphane has 3,000+ published studies behind it. It calms chronic inflammation, the biggest driver of aging, and the amount you take matters.
Sulforaphane
All Sulforaphane storiesThe lab testing reported in this section was commissioned and paid for by the maker of one of the twenty-one products.
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6 things sulforaphane does for your health
One molecule from broccoli switches on your cells’ own defenses, and 6 areas of your health benefit. The studies used 30 to 70 mg a day.
Report
11 of 21 sulforaphane supplements delivered under 1 mg
The label tells you what went into the capsule. See how much sulforaphane each of the 21 delivered, and what to look for if you want the amount the studies used.
The testing was commissioned and paid for by the maker of one of the twenty-one products.
Explainer
Why broccoli alone won’t get you enough sulforaphane
The studies on sulforaphane used 30 to 70 mg a day. That’s more than 4 pounds of raw broccoli, and a supplement only gets you there if it gets 3 things right.
Buyer’s Guide
Which sulforaphane supplement delivers the most?
One product delivered 25 mg of sulforaphane per serving. 11 delivered less than 1 mg. Find your brand in the full table.
The testing was commissioned and paid for by the maker of one of the twenty-one products.
NMN & NAD+
All NMN & NAD+ storiesThe lab testing reported in this section was commissioned and paid for by the maker of one of the six products tested.
Report
Does your NMN contain what the label says?
In 2021, a test of 22 NMN supplements found 14 held almost none of the NMN on their labels. In September 2026, a lab measured 6 leading brands and found something very different.
The testing was commissioned and paid for by the maker of one of the six products tested.
Explainer
How to get your NAD+ back to where it was at 25
Your NAD+ peaked at 25. It has been falling ever since. In a clinical trial, NMN restored it to the age-25 peak level.
Buyer’s Guide
6 NMN brands, measured: labels held up, doses were far apart
All 6 delivered at least 90% of the NMN on their labels. What differs is the dose each brand chose: one serving held anywhere from 260.7 mg of NMN to 1,139.6 mg.
The testing was commissioned and paid for by the maker of one of the six products tested.
List
7 things more NAD+ does for you
One molecule fuels your energy, your DNA repair and the enzymes science links to longer life. It begins to drop around 25, and taking NMN raises it again.
Spermidine
All Spermidine storiesThe lab testing reported in this section was commissioned and paid for by the maker of one of the six products tested.
Explainer
The benefits of fasting, without skipping a meal
Fasting works by triggering autophagy, the deep cleanup inside your cells. Researchers have found the molecule that carries that signal, and it works while you’re eating normally.
Explainer
Microplastics in your brain: what you can do about it
You can’t avoid plastic. But your cells have a way of clearing out what doesn’t belong, and there’s a molecule that switches it on.
Buyer’s Guide
6 spermidine brands, measured. One delivered a full 20 mg.
20 mg meets or exceeds the dosage in every major study linking spermidine to a longer life. One serving of these 6 products held anywhere from 21.9 mg down to 0.7 mg.
The testing was commissioned and paid for by the maker of one of the six products tested.
Guides
All Guides storiesThe lab tests in these guides were commissioned and paid for by the maker of one product in each test.
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Top 7 longevity supplements, and what the studies found
From sulforaphane to vitamin D3: the dose researchers used for each one, who paid for the trials, and what to check before you buy.
Explainer
The 3 supplements longevity scientists recommend most
Sulforaphane, NMN and spermidine are the 3 that longevity scientists name most. See what the research found, and what lab tests of 33 products show about which capsules deliver.
The lab tests were commissioned and paid for by the maker of one product in each test.
Explainer
Only taking one longevity supplement? Start here
You don’t have to start all 3 on the same day. Start with sulforaphane, then add NMN and spermidine. Here’s why.
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6 checks to run before you buy a longevity supplement
6 checks you can run from any product page in a few minutes, and the lab results that show why each one matters.
The lab tests were commissioned and paid for by the maker of one product in each test.