Longevindex
Recently updated guides on Longevindex. We refresh evidence, add comparisons, and expand gear coverage — no separate blog, just better guides. Subscribe on the homepage or via RSS to catch new publishes.
Breathe Right–style strips pull the nasal valve open from the outside. They are a same-night experiment for congestion and simple snoring, and the usual first add-on when mouth tape fails because you cannot get air through your nose. They do not treat obstructive sleep apnea.
Gum inflammation is a longevity input people skip while buying NMN. A water flosser is the tool that gets used. The Waterpik Cordless Advanced (WP-580) is the Amazon default: ADA-accepted, rechargeable, three pressures. String floss still counts if you actually do it. Neither replaces a dentist.
Light through the eyelids is a melatonin signal even when you are asleep. A mask that you keep on beats blackout curtains you never buy and blue-blockers you take off at the laptop. The Manta Sleep Mask is the Amazon default because the cups sit around the eyes instead of on them, which is why flat masks end up on the floor.
EMS (electrical muscle stimulation) makes a muscle contract with a pad. That is different from a massage gun (mechanical), Normatec (compression), and PEMF (a magnetic field you do not contract against). The Compex Sport Elite is the high-ticket Amazon unit with recovery, warm-up, and strength programs. It is an add-on after you can already squat, sleep, and eat protein.
Falls are how a lot of healthspan actually ends: fracture, immobility, then everything else. Balance is trainable and it moves faster than a DEXA score. This guide is single-leg stance, lower-body strength, grip, and when dizziness is a clinician problem. A Captain of Crush gripper is optional. A clear floor is not.
Alcohol is the longevity leak that survives every supplement stack. It fragments sleep, raises blood pressure and triglycerides, and increases the risk of several cancers as intake goes up. A glass of red wine is not a protocol. If you drink, fewer drinks is the change that shows up in sleep and labs. Dependence is medical care, not a biohack week.
Take 5 g of creatine monohydrate every day for muscle, bone, and brain. You do not need a separate higher daily dose for bone — the bone research is still early and is studied with lifting, at ordinary doses. Some short brain studies use about 10–20 g a day, split up. That is a research protocol, not the daily dose this guide uses. Saturation from 5 g a day is the default.
Peter Attia does not publish a single official zone 2 heart rate chart. He uses a talk test, and in a lab a lactate reading near 2 mmol/L. The chart below is the practical substitute: a Maffetone ceiling of 180 minus age, next to 60–70% of estimated max heart rate. Stay under the ceiling only if you can still speak in full sentences, for 3–4 hours a week.
The focus dose is 200 mg of L-theanine with about 100 mg of caffeine, a 2:1 ratio, in the morning. Huberman’s sleep stack uses 100–200 mg of L-theanine before bed with apigenin and magnesium, without the caffeine. The same 200 mg is the amount used in the alpha-wave studies. Matcha has both compounds, but a cup is too small to match these doses.
Sleep temperature regulation is one of the highest-leverage biohacks with genuine evidence behind it, and three systems dominate the category: Eight Sleep Pod, BedJet 3, and Sleepme's Dock Pro (the modern successor to Chilipad, now owned and re-engineered by the same Sleepme team). Eight Sleep uses hydronic water cooling built into a mattress cover with deep sleep-stage automation. BedJet uses forced air instead of water, with no wet components at all. Sleepme's Dock Pro is the direct descendant of the original Chilipad, focused purely on precise temperature control without the smart-home layer. This guide compares the technology, noise, subscriptions, price, and who should buy which. Want the science and budget tiers first? Read Sleep Cooling.
This page compares the Garmin Fenix 8 with Oura and WHOOP. It is not a Fenix 9 Pro review — if a listing says Fenix 9 Pro, the specs below do not apply to it. Fenix 8 is a GPS multisport watch. Oura is a passive sleep ring. WHOOP is a screenless strain band. The [Oura Ring 4 review](/equipment/oura-ring-gen4) covers price and the membership on its own. Narrowed to ring vs band only? See [Oura vs WHOOP](/guides/oura-vs-whoop).
For most men, 15 mg of elemental zinc picolinate with food is the maintain dose. Use 30 mg if you train hard, sweat a lot, or eat little meat. Do not stay above 40 mg a day for months — that is where copper runs low. A 50 mg capsule is a short repletion, not the daily plan. Thorne sells the 15 mg and 30 mg sizes; the buying notes are in [best zinc](/guides/best-zinc).
DEXA is the clinic scan that separates fat, lean tissue, and bone. Ultrasound and skinfold calipers estimate fat under the skin and are useful between scans. Waist circumference is the free check. A smart scale is only a trend line. Weight alone misleads people on GLP-1s, creatine, or a new lifting program.
IQAir HealthPro Plus, AirDoctor 5500, and Blueair Classic 480i are the three air purifiers people compare once they have left $150 Amazon units behind. IQAir and AirDoctor both claim capture down to 0.003 microns. Blueair is quieter and cheaper, and stops at 0.1 microns. This page is the buying decision. For particle science and placement, start with Indoor Air Quality.
AquaTru and Waterdrop G3P800 both use reverse osmosis to cut PFAS, fluoride, and lead. AquaTru sits on the counter and needs no plumber. Waterdrop installs under the sink, runs faster, and is the system you buy when you own the kitchen. This page is that decision. For the wider filter map, including Berkey, see Best Water Filter.
Theragun PRO Plus and Hypervolt 2 Pro are the two massage guns worth comparing once you have ruled out $100 clones. Both hit 16mm of amplitude. Theragun costs $549–$649 and is built around a triangle grip that reaches your own back. Hypervolt costs $399–$449 and adds a pressure sensor. For how to use either one, see Percussion Massage.
BedJet 3 and Sleepme Dock Pro are the two active sleep-cooling systems you can buy on Amazon. BedJet blows conditioned air under the covers for $399–$549. Sleepme circulates water through a pad on the mattress for $699–$999 and holds a surface temperature. Eight Sleep is the more expensive system, and it is not sold on Amazon. For the science of why temperature matters, start with Sleep Cooling.
Normatec 3, a massage gun, and a Compex EMS unit get lumped together as 'recovery gear.' They are three different tools. Normatec squeezes fluid up the legs for $699–$899 while you sit still. A Hypervolt or Theragun hits tight muscle for $399–$649. Compex fires the muscle with electrodes for $549–$749. Buy one. For how to use a gun or boots on their own, see Percussion Massage and Compression Recovery.
On Amazon, the red-light choice that actually ships is a Hooga panel or a CurrentBody face mask. The panel is $120–$170 and treats skin plus a joint or a muscle at a distance. The mask is $449–$549, sits on the face, and runs a fixed 10-minute skin session. A mask will not treat your back. A small panel is an awkward way to do your face every day. Joovv's large panels are a separate, mostly direct-to-consumer purchase.
Biological-age tests are a 2026 longevity trend: a spit or blood kit returns a number that is supposed to be younger or older than your birthday. The clocks were trained on different targets, so two labs can disagree. A lower score does not prove you will live longer. Repeat the same assay if you repeat it at all, and change ApoB, blood pressure, muscle, and sleep before you buy a second kit.
Klotho and follistatin are having a 2026 moment because podcasts describe them as gene therapy that does not edit your genome. Klotho is tied, in observational human data, to cognition. Follistatin can grow muscle in animals. That is not an approved longevity treatment, and it is not a reason to fly somewhere for an injection outside normal drug oversight. This page names the claim and the skip.
AI health interpretation is a 2026 biohacking trend: paste labs into a chatbot and get a protocol. The useful version is a question list for a clinician and a plain-language read of a number you already have. The bad version is a confident dose change, a fake citation, or a full medical record dropped into a tool you do not control. This guide is the boundary.
Women-specific tracking is one of the faster 2026 wellness shifts, and perimenopause is the part with real biology behind it. Estrogen decline changes bone, muscle, sleep, and lipids. The durable work is lifting, protein, a DEXA when it is due, and a clinician for hormone therapy. A cycle app does not replace that, and this page does not dose hormones.
2026 marketing calls berberine, lemon flavonoids, and some collagen peptides ‘natural GLP-1.’ A few small trials show meal-time glucose or incretin shifts. None of them are a GLP-1 receptor agonist drug. They do not reproduce semaglutide’s weight-loss trials, and they are not a reason to stop a prescribed incretin. This page is the distinction.
How Not to Age (2023) is NutritionFacts.org aimed at hallmarks of aging: autophagy, senescent cells, AMPK, and centenarian patterns. The useful protocol is still plants, fiber, and skipping boutique serums. This guide extracts the grocery list and flags where ‘disrupt every pathway’ overreaches.
Built to Move (2023) is The Ready State for people who sit. Ten screens plus ten daily practices — breath, steps, range, sleep. This guide extracts the tests you will actually repeat and pairs the book with a foam roller and a walking habit.
The Comfort Crisis (2021) is the popular case that climate-controlled, overfed life makes you fragile. The protocol that sticks is weighted walking plus outdoor time. This guide extracts the ruck practice and leaves the 33-day hunt as optional memoir.
Why We Get Sick (2020) is the mechanism book under a lot of metabolic Twitter. Bikman argues insulin resistance links diabetes, fatty liver, hypertension, and more. This guide extracts the labs and the boring plan — and tells you when to stay on the drugs you already have.
Vitamin B12 is required for myelin, DNA synthesis, and homocysteine handling. Deficiency is a neuropathy and anemia problem — not a focus hack. This guide covers who needs a lozenge, what to test, and why NOW methyl 1,000 mcg is enough for most plant-based eaters.
Myo-inositol is a sugar alcohol involved in insulin signaling and some neurotransmitter pathways. Sleep-stack culture uses 1–2 g at night; PCOS clinics use grams with D-chiro. This guide separates those protocols and explains why a 500 mg NOW capsule is a trial bottle, not a fertility plan.
187 guides total · Browse all guides
