When-X · Coach map · Not a prescription
When 25-OH D is low
A low 25-hydroxy vitamin D means you are in the group the huge prevention trials mostly did not enroll. Repletion is a real clinical conversation. It is not proof that a bottle will prevent cancer or death.
Read this first
- Coach, not doctor. Aaron Cuha is a coach, not a doctor. No medical credential is claimed for him, or for these pages. A number on a blood test is something to talk over with a doctor, not something to diagnose yourself with. Nothing here is a prescription, a plan to follow, or a reason to start or stop a medicine. Educational use only. This database summarizes published research and is not medical advice. Where a dose appears it is a record of what a trial or clinic ran, or what people describe doing, with its source attached. Nothing here is a recommendation for personal use.
- Knowledge stays free. Knowledge stays free. Every page, every guide and every tool is free to read and stays free. No partner paid for a place on these pages.
- Three kinds of lab page, kept apart. /bloodwork is blood tests for people. /testing and /prices/labs are lab tests on peptide vials. /supplements/quality is what is in the bottle.
What a coach checks first
Confirm the unit (ng/mL or nmol/L). Ask whether calcium and PTH belong beside a very low value. Pregnancy, malabsorption, and kidney disease change the plan and are clinician gates.
What this does not mean
It does not mean VITAL was wrong, and it does not mean 2,000 IU will prevent a heart attack. It does not mean an annual mega-dose is smarter. That design increased falls and fractures.
Markers to ask for on the blood test order
Supplements worth asking about, not orders
What people typically order
Ask for 25-hydroxy vitamin D. If the clinician is considering a higher dose, ask for calcium. K2 is often paired on the owner's floor list. That pairing is a stack choice, not a trial mandate.
When to stop
Retest at about ninety days. If the number did not move, stop guessing the dose in private. If you are already in the 40 to 60 ng/mL conversation band the owner uses, more is not automatically better.