David Sinclair Quietly Dropped Half His Supplement Stack. Nobody Noticed.

If you've been paying attention to the longevity world for the last five years, you've heard David Sinclair's name about a thousand times. Harvard geneticist. The Lifespan book. The Joe Rogan appearance. The "I'm reversing my biological age" claims that launched a billion dollar supplement industry.

For most of the last decade his daily stack was the gold standard. Or at least it was treated that way. NMN. Resveratrol. Metformin. Rapamycin. Vitamin D. The lot. Anyone selling longevity supplements name dropped his routine like it was scripture.

Then he quietly changed it. Multiple times. And almost nobody in the longevity media has talked about it.

So I went and looked.

Compared to his stack from 2020, his 2025 routine has a bunch of additions, a few subtractions that should be making people pay attention, and one swap that says a lot about where the science is actually going.

Let me start with what came out.

Metformin is gone. Or mostly gone.

For years Sinclair was the most prominent advocate for daily metformin as an off label longevity drug. The argument was solid. Metformin activates AMPK, the metabolic switch linked to longer lifespan in basically every animal it's been tested in. Diabetics who take it actually live longer than non diabetics who don't. The TAME trial was supposed to be the big confirmation that it works in non diabetic humans too.

In a 2025 podcast with Peter Diamandis, Sinclair admitted he stopped taking metformin daily. He was getting stomach issues. He swapped it for berberine, the over the counter supplement that hits the same AMPK pathway for about a tenth the price. Berberine doesn't have the same human longevity data, but the mechanism is similar enough that he thinks it's a reasonable substitute.

Translation. The most visible longevity scientist in the world dropped the most talked about longevity drug in the world. Because his guts couldn't handle it.

That should reframe how you think about metformin if you've been considering it.

Then there's rapamycin.

For years the longevity community has treated weekly rapamycin as the holy grail. mTOR inhibition. Lifespan extension in every species tested. Mark Hyman, Peter Attia, Bryan Johnson all on it. Sinclair was on it.

Now he takes it four times a year. Four times. Not weekly. Quarterly.

The reason is immune function. Rapamycin works by suppressing mTOR, which is great for longevity in the abstract but not so great if you'd like your immune system to fight off the flu in the short term. People on weekly rapamycin have had higher rates of infections, slower wound healing, mouth ulcers. Sinclair has hinted that the long term safety data isn't as clean as people pretend.

So he pulled back. Aggressively. Quarterly dosing is essentially a hormetic stress, hit the system hard then let it recover, rather than chronic suppression.

If the most knowledgeable person in the room is dosing rapamycin a quarter of as often as the influencers selling it, that's worth knowing.

He also dropped TMG and taurine.

TMG, trimethylglycine, was supposed to support methylation when taking high dose NMN. The theory was that NAD+ precursors burn through methyl groups in the body and you need to replenish them. Sinclair took it for years.

He stopped. The data didn't hold up. Methylation depletion from NMN appears to be far less of a problem than originally thought. Adding TMG was an unnecessary intervention based on a hypothesis that didn't survive scrutiny.

Same with taurine. There was a big paper in 2023 that suggested taurine was an essential longevity nutrient. Sinclair added it. Within a year he dropped it. The follow up data was inconsistent and he didn't see enough mechanistic justification to keep it in the rotation.

Two supplements he was talking up publicly. Two supplements quietly removed. No big announcement. No "I was wrong" tour.

Now what came in.

Berberine, as mentioned, replaced metformin.

Nattokinase showed up for the first time. Nattokinase is an enzyme from fermented soybeans that breaks down fibrin, the protein that holds blood clots together. Arterial plaque accumulates fibrin over time. Sinclair appears to be using nattokinase to clear the gunk. There's also growing concern in the medical community about micro clots and Sinclair has hinted that this is part of his thinking.

Spermidine stayed. Fisetin stayed at 500mg as a senolytic. Vitamin D3, vitamin K2, alpha lipoic acid, fish oil, CoQ10, low dose aspirin all still there.

NMN is still in his stack. So is resveratrol. He's still committed to the NAD+ thesis even after years of mixed human data.

So what does all this actually tell you?

Three things, I think.

The first is that even the people building the longevity protocols are figuring it out as they go. Sinclair isn't running off a verified script. He's adjusting based on personal experience, emerging data, and his own tolerance. The people selling you "Sinclair's stack" online as the gospel truth are usually selling you a snapshot from three years ago.

The second is that a lot of the longevity stack zeitgeist is downstream of one man's personal experimentation. Whatever he takes, the industry rallies around. Whatever he drops, the industry quietly stops mentioning. There's a strange consensus by celebrity going on that doesn't really match how science is supposed to work.

The third, and this is the bit that should land hardest, is that the most aggressive interventions are coming off the table for the most informed practitioner. Daily metformin out. Weekly rapamycin out. Quarterly rapamycin in. Berberine, a cheap plant compound, in. The pattern is clear. Less drug, less suppression, more nutrient based, more conservative.

The hype machine is going one way. The actual experimenters are going the other.

What's still on his list, by the way, is the boring stuff. Time restricted eating. One main meal at night. Mostly plants. Daily exercise. Cold exposure. Sauna. Sleep cold. Bloodwork tested aggressively. He has said publicly more than once that if you copy nothing else from his routine, copy that part.

The supplements are noise around the signal.

If you've been spending hundreds of dollars a month on a longevity stack inspired by 2020 era David Sinclair, you might be funding an out of date protocol. The man himself has moved on from half of it.

The boring stuff still works. The expensive stuff is getting quieter. And the actual frontier, which we'll get into in other articles, is shifting away from supplements entirely toward gene therapy and cellular reprogramming.

Worth paying attention to what people are actually doing, not just what they're selling.

How does your routine stack up? Take the Longevity Quiz at longevityfutures.online and find out where you really are.

Originally published on [Longevity Futures](https://longevityfutures.online)