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Meditation apps, sleep gadgets, supplements and measurement compared as categories: what each costs per year, what the evidence says, and which ones can tell you whether they are working for you — with a sensible order for a limited budget.

Black Friday for stress and sleep: apps vs gadgets vs supplements — what gives you the most per dollar

The best health investments under $100 this Black Friday

Bought a wellness gadget on Black Friday? How to tell if it's actually working for your body

How much do pacing apps cost in 2026? Required devices, subscriptions and 3-year totals

Energy-Limiting Conditions (ELC)

How to start pacing with what you already own — a diary with a 24–48 hour column, the 50% rule, a morning phone reading and any watch you have — what each can and cannot do, and when a heart rate monitor with alerts is actually worth it

Pacing without buying new gear: how to track your energy envelope with ME/CFS or Long COVID

Energy-Limiting Conditions (ELC)

Want ring-level sleep and stress insights without buying a ring?

Your Apple Watch already records heart rate, HRV, sleep stages, a Sleep Score, overnight Vitals and Training Load — and on the newest models a Readiness score. What each one is, how accurate the sleep and HRV data are, what the watch leaves unexplained, and whether you need another device to read it.

Already have an Apple Watch? What it measures and what it doesn't explain

Phone camera, chest strap, Apple Watch, Galaxy Watch, Garmin, Pixel Watch, Oura or WHOOP: what each costs in year one and over three years on official US list prices, what you get for it — passive 24/7 tracking or spot readings — and what it costs just to read the data from a device you already own.

The real cost of tracking your nervous system in 2026: device + subscription over 1 and 3 years

Do you really need a new wearable this Black Friday? How to track stress and recovery with what you already own

What L. reuteri is, the two strains behind the research, what human trials show for colic and bone loss, how the homemade 36-hour yogurt is made, the oxytocin and skin claims, and who should be careful.

L. reuteri and L. reuteri yogurt: what the trend promises and what the evidence shows

Resveratrol hasn't been shown to repair blood vessel walls. What trials show for endothelial function, blood pressure, arterial stiffness and cholesterol, why red wine doesn't count, typical doses, side effects and drug interactions.

Resveratrol for blood vessels: what it can and can't do for your arteries and blood pressure

Why falling oestrogen causes joint pain, body aches and frozen shoulder, what the musculoskeletal syndrome of menopause is, what helps — from strength training to hormone therapy — and the signs that point to arthritis or another cause.

Menopause and perimenopause joint pain: why your body aches, what helps and when it's something else