Category: For You
In your 20s, most supplements are unnecessary if you eat reasonably well. Here is the honest short list of what actually matters, what to skip, and why sleep, food and movement dwarf any capsule.
Category: Demographic | Reading time: ~12 min | Level: Introductory
Here is a claim you will not hear from most of the industry selling to you: in your 20s, if you are generally healthy and eat reasonably, you probably do not need many supplements at all. That is not a gap in your knowledge that a subscription box fills. It is the honest baseline. Your body at this age is, for most people, at its most resilient and efficient, and a varied diet covers the great majority of what it needs. The supplement industry has nonetheless found in young adults its ideal customer: health-conscious, brand-fluent, influenced by feeds full of people holding tubs, and anxious about optimising a body that is mostly already fine.
So this guide runs against the grain on purpose. Instead of a long list of things to buy, it gives you a short list of what genuinely matters at this stage, a clear account of the handful of situations where a supplement earns its place, and a blunt note on what to skip. And it keeps returning to the least marketable truth of all: the choices that shape your health for the next fifty years, sleep, food, movement, not smoking, are free and dwarf anything in a capsule.
This is general education for healthy young adults, not medical advice. Specific conditions, restrictive diets, pregnancy and certain medications change the picture, and those are exactly the situations where a real need can hide.
A supplement can do one of two honest things: correct a genuine shortfall of a nutrient, or, for a small number of compounds, add a specific effect on top of an adequate diet. In your 20s, the first job is where almost all the real value sits, and it only applies when you actually have a gap. If your intake and blood levels of a nutrient are already fine, adding more of it typically does nothing useful, because the body is not short and cannot bank the surplus into extra health.
That single idea deflates most of the marketing. Products are sold on the implied promise that more nutrients equal more wellness, but for a well-nourished young person that curve is flat: past sufficiency, extra intake buys no benefit, and for a few nutrients it buys harm. So the useful question is never "what should I take to optimise myself," it is "do I have a specific gap, and if so, what is the smallest thing that closes it." Framed that way, the list gets short fast.
If any supplement makes sense as a routine choice in your 20s, it is vitamin D. The reason is simple: genuine shortfalls are common, especially for anyone living at higher latitudes with dark winters, spending most of the day indoors, or with darker skin, since skin produces less vitamin D from limited sunlight. Because the shortfall is widespread and diet supplies relatively little, a modest daily dose over the colder months is a reasonable, well-tolerated step for many young adults, and several public-health bodies already advise it seasonally.
The honest caveats keep it in proportion. Vitamin D is worth correcting where it is low; it is not a wonder nutrient that pays dividends once your level is adequate, and more is not better. If you want to know where you actually stand rather than guessing, a blood test is the reliable way. Vitamin D is fat-soluble, meaning it is stored rather than freely excreted, so very high doses can accumulate and cause problems. A sensible modest dose, ideally guided by your level, is the whole of the advice.
Omega-3 is the other supplement worth genuinely considering in your 20s, but with a clear condition attached: it matters mainly if you rarely eat oily fish. The active marine omega-3s, EPA and DHA, come from fish and seafood, and a sensible general target is in the region of 250mg a day of the two combined [3]. If you eat oily fish like salmon, sardines or mackerel a couple of times a week, you are likely already there and a supplement adds little. If you almost never eat fish, a modest supplement, or algal oil if you are plant-based, is a reasonable way to cover the gap.
Keep the dose modest and the expectations honest. The genuinely strong omega-3 claim is about triglycerides at high, prescription-level doses, which is not what a young person is taking it for, and the everyday wellness benefits are real but modest [3]. At the low doses relevant here you are well clear of the atrial fibrillation and bleeding signals that appear at much higher intakes. Think of omega-3 as filling a dietary gap, not as a cognitive or mood upgrade the evidence does not support at this dose.
Two nutrients get taken for the wrong reasons in your 20s, and both deserve straightening out. Vitamin B12 genuinely matters, but only for specific groups: it is essentially absent from plant foods, so vegans and strict vegetarians need a supplement or fortified foods, and long-term deficiency can cause irreversible nerve damage [2]. For someone eating animal foods, though, routine B12 is unnecessary. Crucially, B12 does not deliver energy unless you are actually deficient; the "B12 for energy" framing only makes sense if you are genuinely short [2]. Taking it as a general pick-me-up while replete does nothing.
Iron is where the energy myth turns risky. Iron does relieve tiredness when it corrects a real deficiency, and shortfalls are more common in people who menstruate, but supplementing iron you do not need offers no benefit and carries genuine harm [4]. Iron is a leading cause of fatal poisoning in young children, it is dangerous in overdose at any age, and about one in two hundred people carry a gene that makes them accumulate iron to damaging levels. So iron is never a casual purchase: it needs a blood test confirming a shortfall, and then guidance, not a guess. The persistent tiredness most young adults feel is far more often about sleep, stress, alcohol or under-eating than about iron, and chasing the actual cause beats supplementing on spec.
The general multivitamin is the emblem of supplementing without a target, and the evidence has never been kind to it. Large evidence reviews, including work synthesised for national prevention guidance, have found little support for routine multivitamins preventing cardiovascular disease or cancer in generally healthy, well-nourished adults, and some single high-dose antioxidant supplements, notably beta-carotene, have been associated with harm rather than benefit [1]. A multivitamin is not dangerous for most people, but it is not the insurance policy the packaging implies, and buying it can create a false sense of coverage that substitutes for the diet that would actually do the job.
The broader "skip" list follows from the same logic. Green powders, most "immune" and "detox" blends, collagen for a 25-year-old's joints, nootropic stacks, and testosterone-adjacent products aimed at young men are, for a healthy person eating reasonably, expensive answers to problems you do not have. The instinct to "take a bit of everything to be safe" is the one to resist hardest, because more is not safer: fat-soluble vitamins accumulate, iron harms in excess, and the scattergun approach spends real money to hedge against imaginary deficits.
Put your attention where the returns are largest, and in your 20s that is emphatically not the supplement aisle. Consistent sleep, a varied diet with enough protein and plenty of plants, regular movement, moderate alcohol, and not smoking or vaping are the choices that compound over decades. They out-perform every product on the shelf, they cost little, and building them as habits now is the highest-leverage health decision available to you. No capsule offsets a pattern of poor sleep and erratic eating, and pretending otherwise is the most expensive mistake in the category.
For supplements specifically, keep the list short and gap-driven. Vitamin D is the most defensible everyday choice, especially in winter. Omega-3 is worth it if fish is missing from your diet. B12 is essential if you are vegan and pointless if you are not deficient. Iron is only ever correct with a confirmed low result and guidance. Pregnancy brings its own specific needs like folate, which are worth planning for early. Outside those situations, most young adults genuinely do not need much, and recognising that is a feature of good health literacy, not a gap in your routine.
Pregnant, breastfeeding, or on medication? Check with a healthcare professional first. Specific flags for this age group: never supplement iron without a blood test confirming you need it, both because excess is harmful and because iron products are a serious poisoning risk if a child in the household finds them. Be wary of stacking single high-dose antioxidants "to be safe," since some have shown harm. And if you take regular medication or hormonal contraception, a quick check is worth it, because some drugs change your nutrient needs or interact by timing.
We are genuinely comfortable telling a healthy 25-year-old that they can put the tub down. The honest list at this age is short: a winter vitamin D, an omega-3 if you skip fish, and a targeted nutrient only where a real gap or a blood test says so. Those appear in our Remedy Library framed by what they actually do, and the many products aimed at young adults that the evidence does not support are ones we would rather not sell you on a false promise.
If you want to work out whether you have a genuine gap worth addressing, Remy can talk you through the evidence and safety notes for any single ingredient, and the Custom Remedy Maker can help you match a short, sensible list to your diet and situation. The best outcome is usually the cheapest one: a couple of well-chosen basics, and your real effort going into the habits that will still be paying off in your 50s.
1. O'Connor EA, et al. Vitamin and mineral supplements for the primary prevention of cardiovascular disease and cancer: an evidence review for the US Preventive Services Task Force. JAMA. 2022. Found little benefit from routine multivitamins in healthy adults and harm signals for some single high-dose antioxidants. 2. NIH Office of Dietary Supplements. Vitamin B12: Fact Sheet for Health Professionals. 2024. Basis for B12 being essential for vegans, capable of causing irreversible nerve damage if deficient, and providing no energy benefit in the absence of deficiency. 3. NIH Office of Dietary Supplements. Omega-3 Fatty Acids: Fact Sheet for Health Professionals. 2024. Basis for the roughly 250mg daily general target and the modest everyday benefit at low doses. 4. NIH Office of Dietary Supplements. Iron: Fact Sheet for Health Professionals. 2024. Documents the overdose and overload risks, the child-poisoning warning, and that iron helps energy only where a deficiency exists.
For most healthy people, very few. Vitamin D is the most defensible everyday choice, particularly in winter, and omega-3 is worth it if you rarely eat oily fish. B12 matters if you are vegan, and iron only if a blood test shows you are low. Beyond that, most products add cost without clear benefit at this stage of life.
Probably not, if you eat reasonably well. Large reviews have found little evidence that routine multivitamins prevent disease or extend life in generally healthy, well-nourished people. A multivitamin is not harmful for most, but it is not the health insurance it is marketed as. Your money and attention do more good directed at sleep, food and activity.
Only if you are actually short of something. Nutrients like B12 and iron improve energy when they correct a genuine deficiency, and do nothing for energy when your levels are already fine. The persistent tiredness most young adults feel usually traces to sleep, stress, alcohol or under-eating, none of which a vitamin fixes. Chase the cause, not a capsule.
No, and it is a common mistake. More is not safer. Some single high-dose antioxidant supplements have been linked to harm rather than benefit in trials, iron is dangerous in excess, and fat-soluble vitamins can build up. Taking a scattergun of products "to be safe" can cost money and, occasionally, cause harm. Target real gaps instead.
When you have a genuine gap: a vegan diet needs B12, a fish-free diet benefits from omega-3, a confirmed deficiency needs correcting, and pregnancy needs specific nutrients like folate. Restrictive diets, certain medical conditions and some medications also create real needs. Outside those situations, most young adults do not need much, and that is good news.
Mostly you are missing a marketing budget, not a nutrient. Supplement use among young adults is driven heavily by social media and wellness branding, not by evidence that healthy people benefit. The people genuinely helped are those with a real gap. If you eat reasonably, sleep enough and have no specific risk, feeling behind for not taking a stack is a manufactured worry.
Into the things with the biggest, most durable payoff: consistent sleep, a varied diet with enough protein and plants, regular movement, moderate alcohol, and not smoking or vaping. These shape your health for decades and cost little. Building those habits in your 20s does far more than any supplement, and it makes the few supplements you might need easier to spot.
Usually the short list is low-risk, but not automatically. Some medications change your needs, hormonal contraception can shift certain nutrient levels, and specific drugs interact with iron, calcium and others by timing. If you take regular medication, it is worth a quick check rather than assuming a supplement is neutral just because it is sold freely.