This one’s rarely spoken about but incredibly eye-opening. Some individuals may have genetic variations in the vitamin D receptor (VDR) gene, which can reduce how effectively vitamin D is used by the body, even if levels appear normal in a blood test.

According to a study, certain VDR polymorphisms are linked to reduced immune response and lower vitamin D efficacy. So, someone may be doing everything right, getting sun, eating well, taking supplements, and still not seeing benefits due to these subtle genetic differences.

Science is only beginning to uncover the layers of this. But it’s a reminder that health is never one-size-fits-all.

[Disclaimer: This article is intended for informational purposes only and does not substitute professional medical advice. Any concerns about vitamin D deficiency should be discussed with a qualified healthcare provider. All facts and studies mentioned here are verified from credible medical sources.]