Author name: Emily Collins, Nutrition Researcher (Supplements & Superfoods)

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

Estimate your monthly out-of-pocket cost for FDA-approved GLP-1 medications. Covers Wegovy, Ozempic, Mounjaro, Zepbound, Saxenda, Trulicity, and Victoza. Math, not medical or financial advice. Prices change frequently. Manufacturer list prices, savings-card terms, and insurance formularies all shift quarterly. The numbers here are 2025 / early-2026 estimates based on publicly disclosed sources. Verify the actual cost

Convert a vial of FDA-approved reconstituted peptide medication into the exact volume to draw on a U-100 insulin syringe. Math, not medical advice. For FDA-approved prescription peptides only. This tool provides math, not medical advice. Always verify the dose with your prescribing physician or pharmacist before drawing any medication. Do not use this tool for