New evidence
In a systematic review of 40 studies, 77.5% showed that pairing zinc or vitamin D with metformin improved fasting glucose — but the same drug can deplete vitamin B12, potentially undermining those gains.
This is among the first systematic looks at how micronutrients interact with metformin for type 2 diabetes, so the finding is promising but still early — treat it as a signal, not a settled answer.
The review pooled 40 studies and found that adding micronutrients like zinc, vitamin D, and antioxidants to metformin therapy led to better blood sugar control in most cases. However, metformin is known to lower vitamin B12 levels, which could counteract some of those benefits — so the net effect depends on which nutrients are in the mix.
Where this fits in the evidence
This is among the first studies we've indexed on Zinc for Reduced Plasma Glucose Levels — treat it as an early signal until more research accumulates.
The study
- Systematic Review
- 2026-02-17
- Frontiers in endocrinology
This is a plain-language summary of a research finding, not medical advice. Pillser surfaces research signals to help you decide what's worth investigating — always consult a qualified professional before changing what you take.