If you take nothing else away from this entire course, take this: start folic acid today if you have not already. Not next month. Not when you are “officially trying.” Today. The timing matters more than the brand, more than whether it is organic, and more than anything else in a supplement aisle
Why Timing Matters More Than Anything
The neural tube is the structure that becomes the brain and spinal cord. It closes between days 21 and 28 after conception. That is about one week after a missed period, and often before a woman even takes a pregnancy test. If the neural tube does not close properly, the result is spina bifida or anencephaly. These are among the most devastating birth defects, and they are among the most preventable.
Folic acid supplementation before conception reduces the risk of neural tube defects by 50-70%. This is one of the most robust findings in all of preventive medicine. The U.S. Preventive Services Task Force gives it an A recommendation, their highest level (1). But the supplement must be in your system before the neural tube closes. Starting folic acid after a positive pregnancy test is better than nothing, but it misses the critical window.
The Standard Dose
For women at average risk, the recommended dose is 400 micrograms (mcg) daily. Start at least one month before conception. Three months is better, because it takes time for folate levels in red blood cells to reach the concentration needed for maximum protection. Most prenatal vitamins contain 800-1000 mcg, which covers the standard recommendation. If you are already taking a prenatal vitamin, check the label and confirm it contains at least 400 mcg of folic acid.
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