Metformin graded. Collagen’s £5bn myth exposed. The sleep habit that cuts mortality 48%. Three interventions, zero hype. 🧬 |
👋 Welcome to Longevity Latest
You’re here because you’re done with miracle supplements and influencer protocols that crumble the moment you check the actual research. Good. So are we.
Longevity Latest exists to do the work you don’t have time for: we read the trials, grade the evidence, flag the hype, and tell you what we’d actually take ourselves. No affiliate links. No sponsored picks. Just data, context, and honest verdicts — delivered weekly in under nine minutes.
In this issue:
• Top 3 Interventions — Metformin, omega-3, and fisetin graded on our A–F scale
• Spotlight — The full case for (and against) metformin as a longevity drug
• Hype Check — Collagen peptides: £5 billion in sales, but what do the RCTs say?
• Superfood — Extra-virgin olive oil and the 92,000-person study you should know
• Deep Dive — AMPK: the master switch connecting exercise, fasting, and metformin
• Biohacking — Why when you sleep matters more than how long (n=60,977)
🔬 Top 3 Interventions Under the Microscope
1. Omega-3 Fatty Acids (EPA/DHA)
Evidence Grade: A Strong human evidence
What it is. EPA and DHA are long-chain polyunsaturated fatty acids found in oily fish. They suppress chronic inflammation via the resolvin and protectin pathways, lower triglycerides, and support cell membrane fluidity — which is why they keep appearing in longevity research.
Evidence (animal/pre-clinical). Omega-3 supplementation reduced inflammatory markers (IL-6, TNF-α) and improved cardiovascular outcomes across multiple rodent models, with additional neuroprotective effects and enhanced mitochondrial respiration.
Human evidence. The VITAL trial (Manson et al., NEJM, 2019; n=25,871; PMID: 30415637) found a 28% reduction in myocardial infarction risk with 1 g/day omega-3 over 5.3 years (HR 0.72, 95% CI 0.59–0.90). A 2021 BMJ meta-analysis (Hu et al.; 38 RCTs, n=149,051; PMID: 34588181) found marine omega-3 supplementation associated with reduced cardiovascular mortality (RR 0.92, 95% CI 0.86–0.98) in a dose-dependent manner. The Framingham offspring cohort linked higher omega-3 index with longer telomere length over 10 years of follow-up.
Cautions. Mild blood-thinning effect — consult a physician if on anticoagulants. Product quality varies enormously; choose IFOS-certified brands. Doses above 3 g/day may raise LDL in some individuals. Enteric-coated capsules reduce the fish-burp problem.
Takeaway. This is as close to a consensus longevity supplement as exists. Large RCTs, strong meta-analytic data, well-understood mechanism, low risk, and affordable. If you take one supplement, the evidence says this should be the one. Evidence Grade A: well-established in humans.
🧪 Personal note: I’ve taken 2 g EPA/DHA daily for three years. My hs-CRP dropped from 1.8 to 0.4 mg/L over the first year — anecdotal, but consistent with what the trials show. I use a third-party-tested triglyceride-form product. |
2. Metformin (Biguanide)
Evidence Grade: B Promising human data
What it is. Metformin is a 60-year-old diabetes drug that activates AMPK, your cells’ master energy sensor, mimicking some effects of caloric restriction: reduced insulin signalling, enhanced autophagy, and suppressed mTOR. It costs under £4/month. Most longevity supplements on your shelf cost ten times more with a fraction of the evidence.
Evidence (animal/pre-clinical). Metformin extended median lifespan by approximately 6% in middle-aged mice (Martin-Montalvo et al., Nature Communications, 2013; PMID: 24245795) and reduced tumour incidence, chronic inflammation, and oxidative damage across multiple rodent models.
Human evidence. Here’s where it gets interesting. Bannister et al. (Diabetes, Obesity and Metabolism, 2014; n=78,241; PMID: 24898834) found that type 2 diabetics taking metformin had lower all-cause mortality than matched non-diabetic controls — people without diabetes were dying sooner than diabetics on this drug. That’s observational, not causal, but it launched the TAME trial (Targeting Ageing with Metformin): a six-year, multi-site RCT in 3,000 non-diabetic adults aged 65–80, expected to report within two years. No completed RCT has yet demonstrated lifespan extension in healthy humans.
Cautions. GI side effects (nausea, diarrhoea) affect up to 25% of users, mostly in the first weeks. Long-term B12 depletion is real and often unmonitored — test annually. Contraindicated in severe renal impairment (eGFR <30). The Konopka et al. finding (Aging Cell, 2019; PMID: 30548390) that metformin may blunt exercise-induced mitochondrial adaptations deserves serious attention from anyone who trains regularly.
Takeaway. The most credible pharmacological candidate for human longevity — but the definitive trial hasn’t reported yet. Evidence Grade B: early human data is encouraging but limited. We’ll upgrade or downgrade the moment TAME publishes.
🧪 Personal note: I started metformin 500 mg extended-release six months ago. Fasting glucose dropped from 5.2 to 4.7 mmol/L. GI side effects lasted about two weeks. I take it on days I don’t do intense exercise, based on the Konopka data. This is self-experimentation, not a recommendation. |
3. Fisetin (Senolytic Flavonoid)
Evidence Grade: C Strong pre-clinical
What it is. Fisetin is a flavonoid found in strawberries and apples that acts as a senolytic — it selectively destroys senescent cells. These are damaged cells that refuse to die, accumulate with age, and secrete inflammatory compounds (the SASP) that poison neighbouring tissue. Clearing them is one of the most promising strategies in ageing biology.
Evidence (animal/pre-clinical). Yousefzadeh et al. (EBioMedicine, 2018; PMID: 30279143) tested 10 flavonoids and identified fisetin as the most potent senolytic. In aged mice (equivalent to 75-year-old humans), intermittent fisetin treatment reduced senescent cell burden across multiple tissues and extended median lifespan by approximately 10% — a large effect for a dietary compound.
Human evidence. The AFFIRM trial (Mayo Clinic; n=40) is the first human RCT of fisetin. Preliminary data shows good tolerability but no statistically significant clinical endpoints yet. A larger follow-up trial is underway. No human lifespan data exists. We are early.
Cautions. Oral bioavailability is poor without lipid-based delivery. Optimal human dosing is not established — mouse-equivalent doses would be 1,500–2,000 mg, far above what most supplements provide. The senolytic rationale calls for intermittent dosing (a two-day “hit-and-run” protocol every few weeks), not daily use — but this is unvalidated in humans.
Takeaway. The senolytic thesis is compelling, and fisetin is the most accessible entry point. But the gap between mouse data and human evidence is wide. If you choose to experiment, use intermittent dosing with a lipid-based formulation — and know that you’re ahead of the evidence. Evidence Grade C: robust animal data; human translation unproven.
🧪 Personal note: I’m not taking fisetin yet. The mouse data is exciting, but I don’t have confidence in the human dosing, the bioavailability of current products, or the optimal protocol. I’m watching the Mayo Clinic follow-up trial closely. When the data justifies it, I’ll be first in line — but “promising in mice” has burned us too many times. |
💡 Spotlight Treatment: Metformin for Longevity
Diabetics on metformin were outliving non-diabetics without it. That single finding changed the entire conversation about ageing. |
Metformin is the drug that made the medical establishment take longevity research seriously. Not because of mouse data — every compound has mouse data. Because of the Bannister observation: in a cohort of 78,241 people, type 2 diabetics taking metformin had lower all-cause mortality than matched controls who didn’t have diabetes at all. That finding was provocative enough to launch the TAME trial, the first FDA-approved clinical trial designed to test whether a drug can slow ageing itself.
Here is the balanced case.
✅ The Case For
Six decades of safety data in millions of diabetic patients. Multiple mechanistic pathways with longevity relevance: AMPK activation, mTOR inhibition, reduced circulating insulin, enhanced autophagy. The Bannister data, while observational, is the strongest epidemiological signal for any repurposed longevity drug. Cost is negligible — under £4/month versus £150+ for NMN supplements with weaker evidence. And if TAME is positive, it would be a watershed moment for the entire field.
❌ The Case Against
TAME has not reported. Until it does, the longevity benefit in healthy humans is inferred, not demonstrated. The GI side effects are genuinely unpleasant for some users. The B12 depletion issue is underappreciated and can cause irreversible neurological damage if unmonitored. Most critically: the Konopka et al. data suggests metformin may blunt the mitochondrial benefits of exercise. If you are someone who trains regularly, this trade-off deserves serious consideration — exercise remains the single most evidence-backed longevity intervention, and compromising its effects for an unproven benefit is a real risk. Finally, it requires a prescription, which creates an access barrier.
Bottom Line
⚠️ Promising but premature. The strongest pharmacological candidate for human longevity, but the trial that matters most hasn’t reported. If you’re considering it, talk to your physician, monitor B12 annually, and consider timing doses away from intense exercise. We’ll update this verdict the day TAME publishes. |
🚨 Hype Check: Collagen Peptides for Skin Ageing
Collagen is a £5 billion industry built on the idea that eating a protein sends it straight to your wrinkles. It doesn’t. |
The Hype. Collagen peptide supplements (£30–60/month) promise to “reverse skin ageing from within.” Brands showcase before-and-after photos, cite clinical trials, and use phrases like “clinically proven.” The global market hit £5 billion in 2024. Your Instagram feed has at least three ads for them right now. The Evidence. A 2021 systematic review (de Miranda et al., International Journal of Dermatology; 19 RCTs, n=1,125) found statistically significant but modest improvements in skin hydration and elasticity. Here’s what the hype misses: the median trial had just 60 participants and lasted 8–12 weeks. The majority were funded by collagen manufacturers. No trial demonstrated clinically meaningful wrinkle reversal. And critically, no study has linked collagen supplementation to any biological ageing mechanism. Why it’s misleading. Collagen is a protein. Your digestive system breaks it into amino acids — glycine, proline, hydroxyproline — exactly like it breaks down chicken breast or lentils. Your body does not shuttle those amino acids preferentially to your face. The modest hydration improvements observed in trials are likely explained by increased total protein intake, which you can achieve for a fraction of the cost. Our verdict. Skip it. If you want to support skin health, ensure adequate dietary protein (1.2–1.6 g/kg/day), vitamin C, and zinc. Wear sunscreen. These are better evidenced and dramatically cheaper. The “anti-ageing” framing is marketing, not science. |
🥦 Superfood Spotlight: Extra-Virgin Olive Oil
Here’s something most longevity content won’t tell you: the single dietary change with the strongest mortality data isn’t a supplement. It’s a condiment. Extra-virgin olive oil is the cornerstone fat of the Mediterranean diet, a daily staple in Sardinia, Ikaria, and coastal Spain — and the epidemiological data behind it dwarfs most supplements in your cupboard.
A 2022 Harvard cohort (Guasch-Ferré et al., JACC; n=92,383; 28-year follow-up; PMID: 35058689) found that consuming more than 7 g/day (½ tablespoon) of olive oil was associated with 19% lower cardiovascular mortality (HR 0.81, 95% CI 0.75–0.87) and 17% lower cancer mortality versus rare consumers. Simply replacing 10 g/day of butter or margarine with olive oil was independently linked to lower all-cause mortality. Ninety-two thousand people over twenty-eight years. That’s not a pilot study.
The active edge is the polyphenols. EVOO contains oleocanthal, which shares its anti-inflammatory mechanism with ibuprofen, and hydroxytyrosol, one of the most potent natural antioxidants measured. Refined olive oil has lost most of these — look for cold-pressed, harvest-dated, single-origin bottles. If the label doesn’t tell you when it was harvested, the producer doesn’t want you to know.
Practical serving: 1–2 tablespoons daily, raw, as a finishing oil on salads, roasted vegetables, or soups. Cook with regular olive oil; finish with the good stuff. Heating degrades the polyphenols you’re paying for.
🔍 Deep Dive: AMPK — The Master Switch of Metabolic Ageing
Exercise, fasting, and metformin have almost nothing in common — except that they all flip the same switch. It’s called AMPK, and it may be the single most important enzyme in ageing biology. When AMPK is activated, your cells shift from growth mode to repair mode: autophagy increases, mTOR signalling drops, insulin sensitivity improves, and mitochondria begin replicating. Every major lifestyle intervention with longevity evidence converges on this one pathway. So do two of the most studied pharmacological agents in ageing: metformin and berberine. But here’s what most longevity content won’t tell you: chronic AMPK activation has downsides. There is a dosing paradox, and getting it wrong may do more harm than good. 🔍 Read the full Deep Dive: AMPK — The Master Switch of Metabolic Ageing → [link] |
⚙️ Biohacking Corner: Sleep Regularity Beats Duration
48% lower all-cause mortality. Not from a drug. Not from a supplement. From going to bed at the same time. |
A 2023 study in the journal Sleep (Windred et al.; n=60,977; UK Biobank) found that sleep regularity was a stronger predictor of all-cause mortality than total sleep duration. Participants in the most regular sleep quintile had 48% lower all-cause mortality than the least regular, after adjusting for sleep duration, age, sex, and comorbidities. The effect size is remarkable — comparable to or larger than many pharmacological interventions we cover.
The longevity conversation around sleep has focused on duration: get your seven to nine hours. This data suggests that consistency may matter even more. Irregular sleep disrupts circadian-regulated cortisol, insulin sensitivity, immune function, and DNA repair — the very processes that determine how fast you age.
Five changes you can make this week:
1. Lock your wake time. Pick a time and hold it within a 30-minute window — including weekends. This is the strongest circadian anchor you have. Non-negotiable.
2. Set a wind-down alarm. 60 minutes before target bedtime. Dim lights, stop screens. Your melatonin onset needs darkness to do its job.
3. Morning light, first 30 minutes. 10–15 minutes of natural light anchors your circadian clock and suppresses residual melatonin. Step outside, not just near a window.
4. Caffeine cut-off: 1 PM. Caffeine half-life is 5–6 hours, but quarter-life is 10–12. That 3 PM coffee is still 25% active at midnight.
5. Track it for two weeks. Use a wearable or a pen-and-paper sleep log. Record bed time and wake time daily. The pattern will surprise you — most people are far less regular than they think.
🧪 Personal note: This study changed my own behaviour more than any supplement trial. I fixed my wake time at 6:15 AM seven days a week, and my HRV (measured via Oura) improved by 12 ms over eight weeks. Correlation, not causation — but the subjective difference was unmistakable. |
📊 Reader Pulse
This week’s question: What is the single longest-running intervention in your routine? The supplement you’ve never stopped. The habit you’ve kept for years. The one thing that survived every protocol change. (Examples: “omega-3, eight years” / “morning walk, since 2019” / “creatine, never missed a day”) Hit reply and tell us in one sentence. We’ll share the results in Issue 02 — and we’ll grade the top three answers. All responses are anonymous unless you say otherwise. |
👋 See You Next Week
Next week in Issue 02: We’re grading the three biggest NAD+ boosters (NMN, NR, and plain niacin — one costs £150/month and one costs £0.03/day, and the evidence might surprise you). Berberine goes under the Spotlight. And our Hype Check takes apart a viral “biological age reversal” study that’s been making the rounds. You’ll want to read that one before you share it.
Know someone who’s tired of longevity hype and wants the evidence instead? Forward this issue. Every subscriber helps us stay independent.
Stay curious and stay healthy!
— The Longevity Latest Team | See you in Next Issue
Medical Disclaimer
Longevity Latest is for informational and educational purposes only. Nothing in this newsletter constitutes medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional before starting any new supplement, medication, or health protocol. Personal notes reflect individual experience and are not presented as evidence. Interventions graded in this newsletter reflect our assessment of the published evidence and do not constitute personal recommendations.
© 2026 Longevity Latest Newsletter