What to watch with Folsäure and blood sugar?

The interaction between folic acid and blood sugar is not well established. Some observational studies suggest high-dose folic acid may slightly influence insulin resistance, but randomized controlled trials are lacking to confirm a causal effect. Additionally, high folic acid intake can mask vitamin B12 deficiency, which is particularly relevant for diabetics on metformin, as metformin reduces B12 absorption. Unrecognized B12 deficiency can cause neurological symptoms that may be mistakenly attributed to diabetic neuropathy. The provided context does not include specific studies on folic acid and blood sugar. Therefore, the evidence level is weak to moderate. Caution is advised: folic acid should not be taken in high doses without medical supervision, especially in individuals with blood sugar issues. Routine B12 screening is recommended for long-term metformin users.