Puberty supplements: what do teenage girls actually need?

Do teenagers really need puberty supplements?

For most teenagers, no, and the exceptions are easy to name. A useful first step is to look at an ordinary week of meals together: which foods turn up often, which are missing, and whether the diet is restricted for any reason, such as vegan eating or a dairy-free plate. A pediatrician (a paediatrician in the UK), a GP or a registered dietitian can go through that list, and many families find the conversation more helpful than any label.

Sport is where the pressure often begins. Teammates and social feeds can make powders and pre-workout drinks look like part of the kit, yet sports bodies advise against performance supplements for under-18s, and strength at this age is built by training well and eating enough. Our guide to exercise in puberty covers what that looks like week to week. Recovery happens overnight too, so teenage sleep deserves as much attention as anything sold in a tub.

Food and fuel connect to periods as well. If periods stop for several months, particularly alongside heavy training, a doctor's visit is the helpful next step rather than a product, and the red-flag list on this page explains the signs in more detail.

Graded by evidence

• strongVitamin D · 600 IU (15 µg) a day in the US; 10 µg (400 IU) in autumn and winter in the UK. Strong when blood levels are low.
• moderateIron · As prescribed, blood test first. Fits when a ferritin result shows low stores.
• goodVitamin B12 · Amount set with a doctor or dietitian. Worth discussing on vegan diets.
• moderateCalcium · 500 mg or less per dose. Only if diet falls short; food sources are preferred.
• moderateMultivitamin · One age-appropriate product. Only for restricted diets; a safety net, not a replacement for food.
• weakProtein powder · None needed. Usually unnecessary. If one is used, third-party tested products (NSF Certified for Sport or Informed Sport) are the usual choice.
• avoidCreatine and pre-workouts · Not advised under 18. Little research in teenagers.
• avoidWeight-loss or detox products · None. Not advised for teenagers; a doctor can talk through any questions.

Which supplements are worth considering in the teenage years?

Vitamin D has the broadest case, and iron, vitamin B12 and calcium join it only in particular situations. Low blood levels, little sun or darker skin are the usual reasons to consider vitamin D, and a blood test can show where levels actually stand, so the decision can rest on a result rather than a hunch.

Iron is a decision best made with a result in hand. A blood test comes first, and if ferritin is low, a doctor prescribes it. Taking it every other day can improve absorption and reduce stomach upset, which is a good question to put to whoever prescribes it.

Many vegan teenagers find a B12 source is worth planning, and a dietitian can set the amount. Calcium is for the teenagers whose diet falls short, with food sources preferred, and a dietitian can help a dairy-free teenager find enough on the plate before a tablet comes into it.

A multivitamin is for restricted diets and works as a safety net rather than a replacement for food, so an age-appropriate product is the one to look for. Protein powder is usually unnecessary, and the table above lists what to look for if one is used.

Needs shift with each stage. For the years before this one, see supplements for children, and for the years after it, supplements in pregnancy. The graded list across every stage sits in supplements for women.

Can supplements help with heavy or painful periods?

Not on their own: heavy or painful periods are a medical question first, and supplements are rarely the answer to them. Iron is the one place the two meet. If a doctor suspects low iron, a ferritin blood test shows whether stores are low, and the doctor can then say whether iron is needed and in what amount. Our page on iron supplements for women goes through how ferritin results and dosing fit together.

For the periods themselves, the evidence supports looking at the cause. The combined pill, the hormonal coil (called a hormonal IUD in the US) or other hormonal methods can make heavy or painful periods much easier to manage, as well as preventing pregnancy. These are options to talk through with a doctor or a sexual health clinic, whichever feels easier to approach.

Heavy periods in the first years are common, but common doesn't mean something to put up with. The red-flag list on this page sets out how much bleeding, how long it lasts and what kind of pain is worth a visit. Many people find it easier to go with a few notes: how often a pad or tampon needed changing, how many days bleeding lasted, and which pain relief was tried.

Some families ask whether prenatal vitamins could stand in for a teen multivitamin. Those are made for a later stage, so an age-appropriate product is the usual fit.

Next steps

A few small steps are a good place to start. Read through the red-flag list and book a doctor's visit if any of it sounds familiar. If vitamin D or iron is the open question, a blood test can give a clear answer, and a registered dietitian can help where a diet is restricted, vegan or dairy-free. Where the table shows only vitamin D, that is a perfectly normal result. From there, you decide what fits, because what suits one family may not suit another: this is not one size fits all.