Knowledge
Magazine
-
The Summer Health Kit: Supplies and Gadgets for Hot Days and Warm Nights
9 min read
-
Oura vs Whoop vs Apple Watch: The Quantified Scientist on What the Accuracy Data Shows
15 min read
-
The Complete Guide to Testosterone Optimization — Part 3: Stress, Psychology, and Purpose
9 min read
Weekly picks on longevity, brands, and health science. No spam—unsubscribe anytime.
Tools
- →The 30s Longevity Guide for Women
- →Postpartum Recovery Guide
- →Perimenopause Longevity Guide
- →Dopamine Reset Guide
- →Pregnancy Longevity Guide
- →Peptide Guide
- →Home Detox Guide
- →Slow Aging Guide
- →Pro Supplement Guide
- →Safe Supplement Guide
- →Bio Age Calculator
- →Blood Testing Guide
- →Deep Sleep Guide
- →Pro Longevity Dashboard
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Knowledge
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- →Improve diet
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- →Track biomarkers
- →Improve sleep
- →Build muscle
- →Increase cardio
- →Detect diseases
- →Recover faster
- →Relieve stress
Magazine
-
The Summer Health Kit: Supplies and Gadgets for Hot Days and Warm Nights
9 min read
-
Oura vs Whoop vs Apple Watch: The Quantified Scientist on What the Accuracy Data Shows
15 min read
-
The Complete Guide to Testosterone Optimization — Part 3: Stress, Psychology, and Purpose
9 min read
Weekly picks on longevity, brands, and health science. No spam—unsubscribe anytime.
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- →Supplements
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- →Wearables & Trackers
Tools
- →The 30s Longevity Guide for Women
- →Postpartum Recovery Guide
- →Perimenopause Longevity Guide
- →Dopamine Reset Guide
- →Pregnancy Longevity Guide
- →Peptide Guide
- →Home Detox Guide
- →Slow Aging Guide
- →Pro Supplement Guide
- →Safe Supplement Guide
- →Bio Age Calculator
- →Blood Testing Guide
- →Deep Sleep Guide
- →Pro Longevity Dashboard
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The90
The90 Gem is a personal UV-sensing wearable from The90, a sun-intelligence brand, worn as part of everyday jewellery and connected to a companion smartphone app. The device measures real-time UVA and UVB exposure, including incidental exposure through windows and daily activity, and estimates a personalised time-to-burn based on the user's skin profile and sunscreen use. Through the app it provides guidance on when to reapply protection, cover up or move out of the sun, alongside longer-term tracking of exposure patterns. Developed with dermatologist and UV specialist Dr Richard Weller as chief medical officer, it is sold direct to consumers with a one-year warranty and a 30-day return policy.
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