14/02/2026
Most people have no idea what their blood level of Vitamin D is.
Yet this single hormone precursor influences thousands of genes, immune resilience, hormone balance, mood regulation and long term disease risk.
Here is what most people are not told.
The reference range on your blood test is designed to prevent severe deficiency diseases like rickets. It is not designed to reflect optimal metabolic or immune function.
There is a big difference between deficient, sufficient and optimal.
Research consistently shows that people with higher Vitamin D status have lower rates of respiratory infections, lower risk of several autoimmune conditions, better mood regulation, healthier hormone signalling and improved outcomes in certain cancers.
You cannot guess your level.
You cannot feel it accurately.
And supplementation without testing is not personalised medicine.
Grab your Metabolic Profile Pathology referral form here, https://astonrx.com/products/rx-program-profile-blood-test or ask your GP for 25 OH Vitamin D and know your number.
At AstonRX we aim for optimal - not just acceptable.