What Vitamins Should Women Take Daily?

Most women only need vitamin D daily from autumn to spring, plus folic acid if pregnancy is possible. Iron and B12 suit specific needs, not everyone.

Most women need only one or two daily supplements: vitamin D in autumn and winter, and folic acid if a pregnancy is possible. Iron, vitamin B12, and a multivitamin (a single pill combining many vitamins and minerals) suit specific groups, such as women with heavy periods or a vegan diet, rather than every woman.

This article draws on NHS guidance on vitamin D and iron, NHS folic acid guidance reviewed in May 2026, the US Preventive Services Task Force's 2022 recommendation statement in JAMA, and a 2024 cohort study of 390,124 adults in JAMA Network Open, current as of September 2026.

Which Vitamins Should Women Take Every Day?

The only supplement the NHS suggests for almost every adult woman is vitamin D, taken daily through autumn and winter. Folic acid is advised for women who could become pregnant, while iron and vitamin B12 are targeted fixes for heavy periods and vegan diets. The best vitamins for women therefore depend on season, diet, and period flow.

Evidence strength for each option, based on the sources cited here:

Vitamin D: strong case for most women in autumn and winter, at the NHS dose of 10 micrograms a day.
Folic acid: strong case for anyone planning a pregnancy, ideally started 3 months before conceiving.
Iron: targeted case for heavy periods or confirmed low iron, not for routine use.
Vitamin B12: targeted case for vegans, since it is not found naturally in plant foods.
Multivitamin: limited case for disease prevention, according to the USPSTF and a 390,124-person cohort.

Taken together, these sources support a short, targeted routine over a long list of daily supplements for women.

Do Women With Heavy Periods Need an Iron Supplement?

Women with heavy periods often need more iron than their diet provides, but a supplement works best after a blood test confirms low stores. The NHS sets the iron requirement at 14.8mg a day for women aged 19 to 49, compared with 8.7mg for men, because monthly blood loss drains iron.

A 2023 research letter in JAMA found iron deficiency in 38.6% of 3,490 US females aged 12 to 21. A 29-year-old who bleeds for eight days each month, changing her pad every two hours on the heaviest days, and who is breathless on the stairs by day three, fits the pattern that justifies a ferritin test (the blood marker of stored iron). The NHS notes that 17mg or less a day of supplemental iron is unlikely to cause harm.

Solu is a women's wellness app that maps cycle-phase-aware guidance across movement, nutrition, sleep, and energy, built for women tracking hormonal, cycle, and premenstrual symptoms. Its daily log records flow heaviness beside energy ratings, so a woman can show a GP how many heavy days came before her most tired week.

Should Women Take Vitamin D in Autumn and Winter?

Yes, the NHS advises everyone, including women, to consider a daily 10 microgram (400 IU) vitamin D supplement during autumn and winter. From late March or early April to the end of September, most people make enough vitamin D from sunlight on their skin, but the sun is too weak in the colder months.

Vitamin D helps regulate calcium and phosphate, which keep bones, teeth, and muscles healthy. That matters for women because bone density falls as oestrogen (estrogen) declines, as covered in the guide to the signs of low oestrogen. As of 2026, the autumn and winter advice applies to all adults, including pregnant and breastfeeding women.

Is a Daily Multivitamin Worth It for Women?

A daily multivitamin is not proven to prevent heart disease, cancer, or early death in healthy adults, so most women do not need one. The US Preventive Services Task Force concluded that "the evidence is insufficient to determine the balance of benefits and harms of supplementation with multivitamins for the prevention of cardiovascular disease or cancer".

A 2024 study in JAMA Network Open followed 390,124 adults for up to 27 years and found multivitamin use was not linked to a lower risk of death. A multivitamin can still fill gaps in a restricted diet, but it is a backup, not a substitute for food. Food-first eating across the month is explained in the guide to eating for your cycle.

Which Women Need Folic Acid or Vitamin B12?

Women who could become pregnant need folic acid, and women on a vegan diet usually need vitamin B12. The NHS advises starting folic acid before pregnancy, ideally 3 months before, and continuing it for the first 12 weeks, because it helps a baby's brain, skull, and spinal cord develop and lowers the risk of spina bifida.

Adults aged 19 to 64 need about 1.5 micrograms of vitamin B12 a day, according to the NHS. B12 is not found naturally in fruit, vegetables, or grains, so vegans often rely on fortified foods or a supplement. Foods that support conception are covered in the guide to what to eat to get pregnant faster.

How Should a Woman Build a Simple Daily Supplement Routine?

A simple daily routine starts with food, adds vitamin D from autumn to early spring, and adds folic acid only if pregnancy is possible. Iron or B12 should follow a blood test or a clear dietary gap. Anyone taking several products should check that the combined dose of each nutrient stays within NHS upper limits.

Solu's phase-based nutrition suggestions lean toward iron-rich meals, such as lentils, spinach, and red meat, during the menstrual phase, when blood loss is highest. Fatigue that clusters before bleeding can have other causes, explained in the article on why women feel so tired before a period. Stress can also disturb appetite and sleep, as covered in the guide to how stress affects the menstrual cycle.

When Should a Woman See a Doctor About Iron or Vitamin Levels?

A woman should see a GP if she changes a pad or tampon every 1 to 2 hours, bleeds for more than 7 days, or passes clots larger than about 2.5cm. These are the NHS markers of heavy periods, and with tiredness or breathlessness they justify an iron check before buying supplements.

Pins and needles, a sore red tongue, or ongoing fatigue on a vegan diet justify a B12 test. Doses above the NHS limit of 100 micrograms (4,000 IU) of vitamin D a day, or above 17mg of iron without medical advice, should be reviewed with a pharmacist. Hormones are sometimes blamed for low energy too, a claim weighed in the guide to whether women should take testosterone.

Key Takeaways

The NHS advises most adults, including women, to consider 10 micrograms of vitamin D daily in autumn and winter.
Folic acid is advised from about 3 months before pregnancy until 12 weeks into it, according to NHS guidance.
Women aged 19 to 49 need 14.8mg of iron a day, and heavy periods are a leading reason iron runs low.
A 2024 cohort of 390,124 adults found multivitamin use was not linked to a lower risk of death.