Prenatal Vitamins When You Aren't Pregnant

Prenatal multivitamin supplements are designed to support the developing fetus and the mother’s health throughout pregnancy. However, they can be beneficial for women who are planning pregnancy, or are breastfeeding.

During pregnancy, the body has higher demands for specific nutrients, such as iron, folate, iodine, and vitamin D. Non-pregnant women may be lacking in these nutrients at times, and prenatals are designed to provide nutrients that are not obtained in the diet.

These typically include:

• Iron (usually around 27 mg): To support red blood cell production and  cognitive function, and prevent iron‑deficiency anaemia, fatigue.
• Folate (usually ~800-1,000 mcg): Required for DNA synthesis, homocysteine metabolism, neurotransmitter synthesis, and many other methylation processes. Deficiency can lead to megaloblastic anaemia, elevated homocysteine, and mood disorders. 
• Iodine (around 150 mcg): Essential for healthy thyroid function and hormone synthesis. Deficiency can lead to hypothyroidism.
• Vitamin D: Essential for healthy bones, immune function, healthy mood. 

Generally speaking, a prenatal is specifically designed to support the body’s nutritional needs through pregnancy. It will usually provide higher amounts of iron and folic acid than a standard women’s multi, as pregnancy increases the demands for these nutrients. Some prenatals may also provide choline, DHA, and other “pregnancy‑specific” nutrients such as ginger, which can help in relieving nausea.

Prenatal formulas can vary significantly between brands, so it’s important to check the ingredients and consider your own individual needs before taking them.

The quantities of some nutrients in prenatals may be higher than the recommended daily intake for non-pregnant adults. These may include:

• Folic acid
  Many standard prenatals provide folate in the form of synthetic folic acid. High intake of folic acid from supplements and/or fortified foods has been linked to several potential health risks, particularly when intakes exceed 1,000 mcg daily.
  These include:
  1. Masking vitamin B12 deficiency
  High doses of folic acid from supplements can correct megaloblastic anemia caused by B12 deficiency. If physicians are only testing for megaloblastic anemia, they may miss the deficiency, allowing neurological damage to continue.¹
  2. Unmetabolized folic acid may accumulate in the bloodstream, especially in people with MTHFR genetic mutations who cannot metabolize it properly. This buildup has been linked to health issues such as depression, bipolar disorder, schizophrenia, and heart disease.² Many prenatals supply 800-1,000 mcg folic acid. Low B12 is common in vegans/vegetarians, or people with malabsorption issues due to digestive disorders or medication use. Chronic use of prenatals in a non‑pregnant woman with undetected low B12 could increase the risk of neurological decline.
  
  
• Iron
  Prenatal supplements usually contain around 27mg iron, while the general recommendation for non-pregnant women is 18mg. Although the upper limit intake of iron for adults is 45 mg/day, a prenatal intake combined with diet and other supplements may be close to this.
  High intakes of iron from supplements can cause gastrointestinal upset, such as nausea, constipation, abdominal pain, and diarrhoea. Excess dietary iron may also affect the absorption of other minerals, including zinc and copper.³

If you are not pregnant or breastfeeding, a prenatal is generally unnecessary. A standard women’s multivitamin may be better suited to your needs.

Multivitamins vary significantly in quality, so look for a supplement with rigorous quality control and a comprehensive range of bioactive ingredients.

Taking a prenatal when planning pregnancy is a good way to build a strong nutritional foundation that prepares your body for pregnancy - depending on the specific formula and your own health needs. Prenatals generally contain folate, B12, iron, and other nutrients required for maternal health.

Women are advised to supplement with 400 µg folic acid daily from preconception through at least 12 weeks gestation.⁴ This is because folate is required for numerous processes that occur during the first 3-4 weeks after conception, when the neural tube and early brain structures are forming. Neural tube closure is complete by day 28, so it is critical that folate levels are optimal by this time. If a woman’s folate levels are already deficient, it can take several weeks of supplementation to restore healthy levels.

It’s important to note that many prenatals contain folic acid, which may not be suitable for women who have genetic MTHFR mutations. Variants such as the C677T mutation can impair the metabolism of folic acid, which can affect the availability of folate to the developing fetus and increase the risk of unmetabolized folic acid accumulation, along with other potential health issues.⁵

Taking methylfolate (the active form of folate) is recommended over folic acid as it is immediately available for use in the body and bypasses the MTHFR mutation. Methylfolate can be taken as a supplement on its own or within a prenatal formula.