Tools

Calculate your creatine dose by body weight for loading or daily maintenance. Most adults can skip loading and just take 3-5 g/day — saturation just takes 3-4 weeks instead of 5-7 days. Math from ISSN guidelines, not medical advice. Creatine monohydrate is the gold standard. 700+ studies, decades of safety data, ~$0.10/serving. The “advanced” forms […]

Choose between CoQ10 (ubiquinone) and Ubiquinol by age, statin use, and heart goal. After ~40, the body’s ability to convert ubiquinone to active ubiquinol declines — that’s where Ubiquinol justifies its 3× price. Under 40, ubiquinone works fine. Math, not medical advice. The 40+ rule: ubiquinone (cheaper CoQ10) converts to ubiquinol in the body, but

📚 Researched & cited by UV Editorial Team Independently reviewed · Last updated: May 29, 2026 · Our research methodology → Jump to section ▼ What we DO What we DON’T Where this leaves us Editorial independence Updates and corrections Contact Editorial standards The standards behind every supplement review on this site: what we verify,

DTC Greens Powder Cost & Ingredient Comparator | UsefulVitamins DTC Greens Powder Cost & Ingredient Comparator Not all greens powders are created equal — or priced the same. This tool filters 10 products (4 DTC brands, 6 Amazon picks) by your monthly budget, dietary needs, and health goal, then surfaces the top 3 by value

📚 Researched & cited by UV Editorial Team Independently reviewed · Last updated: May 29, 2026 · Our research methodology → 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

📚 Researched & cited by UV Editorial Team Independently reviewed · Last updated: May 30, 2026 · Our research methodology → 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

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).

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