30 articles on biohacking, recovery, and performance
The Libre app is free and works with iPhones iOS 16.0+ and Android phones 11+. Which models exactly fit, how to reinstall the app, and what happens to your running sensor when you switch phones – plus troubleshooting for connection errors. Last updated 25.10.2026.
The Libre 3 Plus lasts up to 15 days and costs self-payers €70.60 per sensor from Abbott Germany. How it differs from the Libre 3, when German health insurance pays, which phones and pumps work, and how to check the recall. As of 23 Oct 2026.
Garmin Cirqa in S–M (120–200 mm) or L–XL (145–240 mm)? How to measure your wrist, what applies in the overlap range, what the upper arm band needs, and price and delivery time in Germany. No subscription needed. As of 18 Oct 2026.
Garmin sells three fitness bands in Germany: Cirqa (€199.99, screenless), vívosmart 5 (€149.99, with display) and the Index Sleep Monitor (€159.99, sleep only). What they measure, what they cost, how fast they ship and why none needs a subscription. As of 18 Oct 2026.
The Oura Ring 4 currently costs €265.30 instead of €379 in Oura's German store. What the membership adds, what remains without it, which sizes exist and when the Ring 5 is the better pick. As of 18 Oct 2026.
Garmin Cirqa (€199.99, no subscription) vs. Fitbit Air (€99.99, Premium optional): battery life per manufacturer and per reviews, sensors, three-year subscription costs and availability in Germany. As of 17 Oct 2026.
The Oura Ring 5 costs €429 or €529 at Oura in Germany, while the Ring 4 is currently from €265.30. What the Ring 5 does differently (40% smaller, 6 to 9 days battery, sizes 6–13 only, 3 days of storage), what the membership costs and who the extra money is worth it for. As of 17 Oct 2026.
Max has worn both the WHOOP 4.0 and the WHOOP 5.0 day to day. His take: early accuracy issues, much longer battery life. Plus the facts as of October 2026: 14+ days battery, €199/€264/€399 a year in Germany, ECG only on the MG.
Oura no longer sells the Gen3 but still ships firmware updates and new features for it. What a used Gen3 plus membership costs, which risks Oura itself names, and what Ring 4 and Ring 5 do differently.
The Galaxy Ring still exists in one generation only. Samsung's German store lists it as sold out; retailers sell it from €209.99. No subscription, Android only, up to 7 days of battery. As of 16 Oct 2026.
How accurately do rings, bands and watches measure your sleep? Validation studies against the sleep lab, evidence-based basics without the hype, and a guide to every sleep article on this site.
What methylene blue is approved for as a medicine, which side effects the label lists, why serotonin syndrome is the biggest risk, and what is behind the drops sold online.
Oura's German store currently sells the Oura Ring 4 Ceramic for €300.30 instead of €429. How it differs from the titanium Ring 4 and the Ring 5, which colours are left and how tough ceramic is.
Which WHOOP bands exist, what One, Peak and Life cost in Germany, which straps fit and whether WHOOP works without a subscription. Prices as of 15 Oct 2026.
Payment chips under the skin, glowing plants, gene-edited embryos: a fact check of the German Netflix series Biohackers. What actually exists, what is illegal in Germany and what is made up.
Dexcom G7 and Dexcom Flex are sold in Germany via Dexcom's webshop, Stelo only in the US. Prices, intended use, evidence for healthy people and what is going on at Dexcom in October 2026.
Oura Ring 5 (€429 + membership) vs Ultrahuman Ring Pro (€499, no subscription): battery, features, EU prices and 5-year cost. Updated September 2026.
From 23andMe to Whole Genome Sequencing: which providers are worth it in 2026, why raw genome data does NOT belong in cloud LLMs, and how to use Claude locally for meaningful interpretation. No hype, no genome-coach nonsense.
Oura Ring 5 costs €429 plus €5.99/month. 6 smart rings with no subscription compared: RingConn Gen 3, Luna Gen 2, Ultrahuman, Samsung. EU prices, Sept 2026.
Abbott Lingo still has no German store and no launch date. What FreeStyle Libre 3 Plus costs and does instead — plus whether a UK import is worth it.
Whoop, Oura, blood work, and supplements in one local SQLite database on your own hardware. How openclaw-biohub sidesteps vendor lock-in and surfaces supplement correlations that no wearable app will show you.
Three bottles, 16 months, 254 nights on methylene blue against 318 control nights. The TikTok promises — more HRV, deeper sleep, more energy — aren't in the data. If anything, the opposite.
I wanted to write the classic Sleepmaxxing piece: 30 days strict protocol, Whoop numbers up, done. What I actually found in 21 months of data looks different.
576 days of Whoop HRV data, 35 supplements, 38 intake periods, and the methodology mistake I almost published. What 19 months of N=1 self-experimentation actually proved.
The 2026 wearable landscape compared on specs and cost: Oura Ring Gen 4, Circular, RingConn, Samsung Galaxy Ring against Apple Watch, Garmin and Fitbit. Battery, price, ecosystem — and where each form factor actually makes sense.
Which fitness wearable is worth it in 2026? Whoop 4.0 from a year of daily use, plus a specification and cost comparison of Oura Ring Gen 3, Garmin and Withings — what each device does, what it costs, and who it fits.
Biohacking without the hype: the 5 tools that actually make a difference — and why you don't need most of the expensive gadgets people sell you.
What a FreeStyle Libre 3 costs a non-diabetic, how to get one legally in Europe, what the accuracy studies actually show — and who it pays off for.
HRV is the most important recovery biomarker you're probably ignoring. A complete guide: what it means, how to measure it, and what my Whoop data actually shows.
I've worn Whoop 4.0 daily for over a year. My honest review: what works, what's frustrating, and who should actually buy it.