Best Vitamins & Supplements: Evidence-Based Guides

Chronological reference of FDA actions and major court rulings affecting compounded semaglutide and tirzepatide from the start of the GLP-1 shortages (2022) through April 2026. Each event has its own permalink anchor and is sourced to FDA documents, court filings, or contemporaneous coverage. Last updated: 2026-04-27. The compounded-GLP-1 enforcement story is still unfolding — we […]

Citable numbers on GLP-1 receptor agonists (semaglutide, tirzepatide, liraglutide, dulaglutide, exenatide) — market size, prescription volume, user demographics, clinical outcomes, pricing, insurance, side effects, and regulatory actions. Every stat is sourced. Use the anchor links to cite specific numbers. Last updated: 2026-04-27. Statistics on this page are gathered from FDA prescribing information, peer-reviewed clinical trials

Calculate the latest time you should drink your last caffeinated beverage based on your target bedtime, your caffeine sensitivity, and the dose. Built on a pharmacokinetic decay model with Drake 2013 sleep-disruption evidence as the threshold. Math, not medical advice. Caffeine half-life varies a lot between people. Average is about 5 hours, but pregnancy can

Estimate the daily vitamin D3 dose needed to raise your serum 25(OH)D from a known baseline to a target level. Based on Heaney 2003 dose-response (~100 IU/day per 1 ng/mL increase, weight-adjusted). Math, not medical advice. Get a serum 25(OH)D blood test before high-dose supplementation. The Endocrine Society recommends measuring 25(OH)D in adults at risk

Convert vitamin D between micrograms (mcg) and International Units (IU). Works for both D3 (cholecalciferol) and D2 (ergocalciferol) — they share the same conversion factor. Math, not medical advice. 1 mcg vitamin D = 40 IU. The conversion factor is fixed by FDA / IOM definition and applies equally to D3 (cholecalciferol) and D2 (ergocalciferol).

A guided 5-question wizard that maps you to the FDA-approved peptide options most likely to match your situation. Restricted to FDA-approved peptides — every answer ends with “consult your prescriber.” This is not medical advice and does not replace a clinician. The recommendations are conversation starters for your prescriber, not prescriptions. Final decisions belong to

Compare 2 or 3 peptides head-to-head: FDA status, primary indication, typical dose, evidence level, monthly cost, side effects, and the deep-dive article on each one. Comparison rows are based on FDA prescribing information, manufacturer-published prices, and the published RCT literature as of 2026-04-27. Not medical advice — verify with your prescriber before starting any peptide.

Track your GLP-1 dose-escalation schedule from FDA-labeled titration. Pick your drug and start date — the tool shows your current week, current dose, next escalation date, and total weeks to maintenance. Schedules below come directly from the FDA prescribing information. Your prescriber may slow titration if you experience side effects, or hold a dose longer

Look up the FDA approval status of any peptide — semaglutide, BPC-157, GHK-Cu, tesamorelin, and 30+ others. The status badge tells you whether you can legally buy it as a drug, supplement, or research chemical. “Sold online” doesn’t mean “legal to use.” Many grey-market peptides labeled “research peptides” or “research chemicals” are sold without FDA

Find your daily collagen target based on what you’re trying to support — skin, joints, or muscle. Doses below come from human RCTs, not marketing copy. Math, not medical advice. Collagen is a supplement, not a drug. Doses below are typical RCT amounts that produced measurable effects in published studies. Most studies use flat doses