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Based on the information available, there is no one-size-fits-all answer to how long folic acid should be delayed as it can depend on various factors such as individual health conditions and the reason for supplementation. However, some studies suggest that taking folic acid at least one month before conception and throughout the first trimester of pregnancy can help reduce the risk of neural tube defects in babies [1].

It's important to note that folic acid supplementation should not be delayed indefinitely, especially for those who are planning to become pregnant or are in the early stages of pregnancy. This is because the neural tube, which becomes the brain and spinal cord, develops during the first 28 days of pregnancy, often before a woman knows she is pregnant [2].

Furthermore, it's advised to consult with a healthcare provider before starting any new supplement regimen, including folic acid, to ensure it's safe and appropriate for individual health circumstances [3].

In summary, while the duration of folic acid delay can vary, it's generally recommended to start supplementation at least one month before conception and continue through the first trimester. However, it's crucial to consult with a healthcare provider for personalized advice.

Sources:
[1] <https://www.ncbi.nlm.nih.gov/books/NBK111589/>
[2] <https://www.marchofdimes.org/complications/neural-tube-defects.aspx>
[3] <https://www.drugpatentwatch.com/folic-acid-patent-expiration-date/>