Nutrition – Onlinemeds
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Nutrition

Evidence-based articles on diet, vitamins, minerals, and healthy eating.

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Vitamin D deficiency: who should be tested and what dose works
Nutrition

Vitamin D deficiency: who should be tested and what dose works

A clinical guide to vitamin D deficiency. Learn who is actually at risk, how to interpret your blood test results, and the most effective way to take your supplement.

HT
By Henry Thomas
· 8 min read · Updated Jul 8, 2026 Clinically reviewed
Vitamin B12 deficiency in vegetarians and metformin users
Nutrition

Vitamin B12 deficiency in vegetarians and metformin users

A deep dive into why certain diets and common diabetes medications deplete your Vitamin B12, and how to identify the early, subtle neurological warning signs.

HT
By Henry Thomas
· 8 min read · Updated Jul 8, 2026 Clinically reviewed
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