Your body asks for slightly different things at twenty, at thirty-five and at sixty. Here is a calm, food-first map of the nutrients that matter most along the way.
⏱️ 8-minute read · Words by Chiara Ugozzoli · Updated June 2026
TLDR: Food comes first, and a varied plate covers most of what you need. A few nutrients deserve extra attention at different life stages: iron and calcium in the teens, iron and folate in the reproductive years, folic acid and vitamin D in pregnancy, and calcium and vitamin D around menopause and beyond. Most people in the UK benefit from a daily vitamin D supplement in autumn and winter, and supplements work best as a top-up where the evidence supports them.
Why do my vitamin needs keep changing?
Think of your nutrient needs as a wardrobe you gently update season by season. The basics stay the same, and you simply swap a few pieces as your life shifts. Periods, pregnancy, busy years of caring for others and the hormonal changes of midlife each ask your body for slightly different support.
The single most reassuring idea here is food-first. A plate built around vegetables, fruit, wholegrains, beans, fish, eggs, dairy or fortified alternatives, nuts and seeds delivers most of what you need across your whole life. Supplements step in to fill specific, evidence-backed gaps, and the sections below show where those gaps tend to appear.
Picture this. You stand in the supplement aisle, faced with a wall of bottles promising everything, feeling a familiar flicker of guilt that you should probably be taking all of them. Take a breath. For most women, a good plate plus one or two well-chosen extras does far more than a basket full of pills you forget by Thursday.
Teens: building the foundations
The teenage years are a building phase, and two nutrients stand out. Iron matters because monthly periods begin to draw on the body’s stores, and calcium matters because the bones are laying down strength that lasts a lifetime.
The NIH Office of Dietary Supplements iron fact sheet notes that teenage girls and women who still have periods are among those most likely to fall short on iron. Lean red meat, beans, lentils, tofu and leafy greens all help, and pairing plant sources with a squeeze of vitamin C, think oranges, peppers or tomatoes, helps the body absorb more. For bones, dairy, fortified plant milks, tinned fish with soft bones and green vegetables build the calcium foundation.
Your 20s and 30s: energy and iron
Through your twenties and thirties, life often runs at full tilt, and iron sits right at the heart of how energetic you feel. It carries oxygen around your body, so when stores run low, the first signs are usually tiredness, breathlessness on the stairs and a foggy, flat feeling that coffee fails to lift. The NIH iron fact sheet highlights menstruating women as a group who commonly run short, particularly with heavier periods, which makes iron-rich meals a genuinely practical form of self-care in these decades.
Folate, the natural form of folic acid, becomes quietly important too, partly because it supports the early weeks of any pregnancy, often in the earliest weeks before a test would read positive. Leafy greens, beans, lentils, citrus fruit and fortified breakfast cereals all carry it, so building a folate habit now means your body already has reserves in place.
Here is what a gently iron-friendly day on a plate can look like, with no calorie counting required:
- Breakfast: fortified wholegrain cereal or porridge topped with sliced strawberries or a small glass of orange juice. The vitamin C helps your body take up more of the iron.
- Lunch: a lentil and spinach soup with a wholemeal roll, or a chickpea salad with peppers, tomato and a squeeze of lemon.
- Snack: a handful of pumpkin seeds and dried apricots, or hummus with carrot sticks.
- Dinner: a small portion of lean beef, or tofu and black beans for a plant-based plate, with broccoli and a baked sweet potato.
- One easy tweak: enjoy tea and coffee between meals, on their own, because the tannins gently slow iron absorption when you sip them alongside an iron-rich plate.
That last tweak is the affirmative version of a common tip: keep your brew for mid-morning or mid-afternoon, and let your iron-rich meals shine on their own.
The reproductive years: iron, folate and energy
Through your twenties and thirties, iron stays high on the list, especially with heavier periods. Folate keeps earning its place too, supporting cell growth and energy alongside that early-pregnancy role. If pregnancy is anywhere on your horizon, the next section becomes especially relevant, because the timing of folic acid is one of the clearest pieces of evidence in women’s nutrition.
Pregnancy: the clearest case for supplements
Pregnancy is the one life stage where specific supplements move from helpful to firmly recommended. The NHS guidance on vitamins in pregnancy advises 400 micrograms of folic acid every day from before conception until 12 weeks of pregnancy, because it lowers the risk of neural tube conditions such as spina bifida in the developing baby. The same guidance recommends a daily 10 microgram vitamin D supplement through pregnancy and breastfeeding.
There is also a clear safety message worth keeping. The NHS advises that vitamin A (retinol) and cod liver oil stay off the menu during pregnancy, because too much vitamin A can harm the baby. The simple, affirmative move is to choose a pregnancy-specific supplement that deliberately keeps vitamin A out, since these are formulated for exactly this stage. Reading the label closely truly earns its keep here, so a chat with your midwife or doctor about your specific supplement is time well spent.
Menopause and beyond: protecting your bones
As oestrogen settles into its lower midlife level, bone strength asks for steady attention, which puts calcium and vitamin D back in the spotlight. Vitamin D helps your body absorb calcium, so the two work as a partnership.
The NHS vitamin D guidance recommends that adults get 10 micrograms of vitamin D a day, and advises everyone to consider a daily 10 microgram supplement through autumn and winter, when sunlight in the UK is too weak for the skin to make its own. The guidance adds a simple ceiling: keep below 100 micrograms a day, because more can be harmful. For calcium, keep the dairy, fortified alternatives, tinned fish and green vegetables coming, and pair them with regular weight-bearing movement like walking, which gives bones a reason to stay strong.
Supplements worth skipping
The wellness aisle is brilliant at making everything feel essential, so it helps to know where the evidence is thin and your money is better kept in your purse. Skipping these frees you to focus on the few that genuinely earn their place.
- A daily multivitamin “just in case” when you eat well. A varied plate already covers most bases for most healthy women, so a broad multivitamin often duplicates what dinner gave you. Choosing the specific nutrient your life stage calls for tends to serve you better.
- Mega-dose single vitamins. The right amount beats the largest amount. The NHS sets a clear ceiling on vitamin D at 100 micrograms a day, and very high doses of fat-soluble vitamins can build up and cause harm. Stick to the recommended amounts and skip the heroic doses.
- Vitamin A supplements in pregnancy. As above, choose a pregnancy formula that keeps vitamin A (retinol) out, and pass on standalone vitamin A or cod liver oil for these months.
- “Detox” or “hormone balance” blends with long, vague ingredient lists. These often lean on proprietary mixes with little evidence behind the claims. A clear, single-purpose supplement you actually understand is the wiser buy.
- Iron supplements taken without a reason. Iron is wonderful when you are genuinely low, and surplus iron can cause side effects and mask other things. Let a simple blood test be your guide, so you supplement with confidence.
The thread running through all of this: spend on the gap the evidence actually shows, and let your plate carry the rest.
Try this tonight: Open your kitchen cupboard and find your vitamin D. If you have none, add a simple 10 microgram daily supplement to your shopping list for the autumn and winter months. Then glance at your dinner plate and ask one kind question: is there a source of iron or calcium on it today? Small, repeatable habits beat grand resolutions every time.
The gentle takeaway
Across every decade, a colourful, varied plate does most of the heavy lifting, and a few well-chosen supplements fill the gaps the evidence has clearly mapped. Your needs evolve, and meeting them is an act of quiet self-respect that fits easily into an ordinary day. Before starting anything new, especially in pregnancy or if you take other medicines, have a quick word with your doctor or pharmacist so your choices fit you.
PrettyWell is a women’s lifestyle and wellbeing magazine. This article shares general information and wellbeing perspectives to help you ask better questions and feel more in charge; for anything about your own health, please speak with a qualified healthcare professional.
References
- NIH Office of Dietary Supplements, Iron Health Professional Fact Sheet. https://ods.od.nih.gov/factsheets/Iron-HealthProfessional/
- NHS, Vitamins, minerals and supplements in pregnancy. https://www.nhs.uk/pregnancy/keeping-well/vitamins-supplements-and-nutrition/
- NHS, Vitamin D. https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-d/
