What vitamin supplements are actually worth taking?

Thirteen vitamins sorted by storage: the four the body keeps and the nine it flushes, why storage decides the risk side of worth, and the one water-soluble exception with a nerve record

What vitamin supplements are actually worth taking is a question about thirteen specific substances, and the shelf answers it with products that contain all thirteen at once, which is the first sign that the shelf has not sorted them. The honest sort begins with how the body stores each vitamin, because storage decides the risk side of worth before the benefit side is even considered. Four vitamins are fat-soluble: A, D, E and K dissolve in fat, are absorbed with it, and are stored in the liver and the fat tissue, where they accumulate when intake runs ahead of need; a fat-soluble vitamin taken above its upper level for long enough reaches a level the body cannot clear quickly, which is why vitamin A in excess is a known harm, why vitamin D has an upper level that a high-potency product can cross, and why vitamin E at high doses has a trial record of harm rather than benefit. Nine are water-soluble: the eight B vitamins, thiamine, riboflavin, niacin, pantothenic acid, B6, biotin, folate and B12, and vitamin C dissolve in water, are absorbed as needed, and are mostly excreted when the intake runs ahead of need, so that an excess of most of them is expensive urine rather than a harm.

The water-soluble class has one exception that the shelf never mentions, and it is B6. Pyridoxine at high doses, the doses some high-strength B complexes and single products contain, taken over time, damages the peripheral nerves, producing numbness and tingling in the hands and feet that the records of the UK and European assessments describe and that recovers slowly or incompletely when the supplement is stopped; the UK upper level for B6 is low by the standards of the shelf, and a product that crosses it is worth avoiding rather than worth taking. Niacin at high doses flushes the skin and at very high doses troubles the liver, but those doses are a doctor's; B6 is the one that an ordinary buyer can reach from an ordinary shelf.

With the storage sort done, worth taking is decided for each vitamin by setting three things side by side: the shortfall the UK survey or the public health advice finds, which is the benefit side; the upper level, which is the risk side; and the authorised claim, which is the honest statement of what the vitamin does. A vitamin with a named shortfall, a dose below the upper level and a claim is worth a tub; a vitamin with no shortfall is worth nothing from a tub whatever its claim; and a vitamin with a harm record at the shelf's doses is worth avoiding. The next section runs the thirteen through that sort.

Thirteen vitamins sorted into two classes with one exception, and the three-part test set, with the three worth a tub, the groups the survey names, the two sold into no shortfall, the worked example outside the vitamins and the verdict in the next section.

The thirteen run through the sort: three worth a tub, two short in groups the survey names, two sold into no shortfall, one worth avoiding at high dose, and the rest covered by a plate; the worked example outside the vitamins; and the verdict

Three vitamins pass the sort outright. Vitamin D, fat-soluble but short in a large share of the UK population through the autumn and winter, is worth a tub at ten micrograms a day for everyone through those months, with claims for normal muscle function, bones and immune function, and the upper level well above that dose; the one caution is the high-potency products at many times the advice's dose, which cross the fat-soluble line. Vitamin B12, water-soluble and absent from all plant foods, is worth a tub for anyone eating no animal foods and for older adults a doctor finds absorbing it poorly, with claims for normal red blood cell formation and the reduction of tiredness and fatigue, and no upper level of concern. Folate, as folic acid, is worth a tub for anyone who could become pregnant and through early pregnancy, at the standard dose the advice names, because the neural tube closes before most pregnancies are confirmed, and for no one else from a varied plate. Those three have a named shortfall, a safe dose and a claim, and they are the vitamins actually worth taking.

Two are short in groups the survey names and worth a tub only in those groups. Riboflavin is short in a share of young women and in people eating no dairy, and is corrected at pence; vitamin A, fat-soluble and stored, is short in a share of young adults on the survey but is also the vitamin most easily taken to excess, so it is corrected from the plate, liver, eggs, dairy and the orange and green vegetables, and from a tub only on a doctor's reading, never in pregnancy. Two are sold into no shortfall: vitamin C, which the survey finds almost no one short of and the trials find nothing for in the replete beyond a modest shortening of colds in people under heavy physical stress; and vitamin E, which is short in no group, is a fat-soluble store, and has a trial record at high doses of harm rather than benefit. Those two are the vitamins the shelf sells hardest, and they fail the sort on the benefit side before the risk side is reached. One is worth avoiding at the shelf's doses, B6 above its upper level, with the harm described above; at the dose in a varied plate or a sensible complex it is fine, and the line is the upper level, not the vitamin. The rest, thiamine, niacin, pantothenic acid, biotin and vitamin K, are covered by any varied plate, short in almost no one on the survey, and not worth a tub; biotin's hair and nail pitch has no trial behind it in the replete, and vitamin K is a doctor's question for anyone on an anticoagulant, who does not take it from a shelf.

The worked example is outside the vitamins and is placed as what it is, a mineral on a plate reading: {FL}, 1500mg magnesium bisglycinate stated as 300mg elemental at 80% NRV, two capsules with the evening meal, holds authorised claims for normal muscle function and the reduction of tiredness and fatigue, sits below the supplemental upper level, is batch tested for lead, mercury, arsenic and cadmium, UK made under GMP and BRC, 180 capsules for £19.99 at 22p a day, and is worth a tub for the share of adults the survey finds short of the nuts, seeds, pulses, whole grains and greens that carry the mineral, which a few days of counting the plate settles. The full label breakdown is here. A person who is pregnant raises every vitamin on this page with a doctor or midwife, a person on a medicine asks a pharmacist, and vitamin A and high-dose anything are off the table in pregnancy.

The verdict: sorted by storage and run through the three-part test, three vitamins are actually worth taking, vitamin D for everyone through the UK autumn and winter, B12 for anyone eating no animal foods, and folic acid for anyone who could become pregnant. Riboflavin and vitamin A are worth correcting in the groups the survey names, vitamin A from the plate; vitamin C and E are sold into no shortfall; B6 above its upper level is worth avoiding; and the rest are covered by a varied plate. A tub containing all thirteen has not sorted them, and a buyer who sorts them buys three.

What to check on the label

Questions people also ask

Which vitamins are worth taking as supplements?

Three, after sorting the thirteen by storage and testing each against its UK shortfall, its upper level and its claim: vitamin D at ten micrograms a day for everyone through the UK autumn and winter, when a large share of the population is short and the skin cannot make it; vitamin B12 for anyone eating no animal foods and for older adults a doctor finds absorbing it poorly; and folic acid for anyone who could become pregnant and through early pregnancy; riboflavin is worth correcting in the groups the survey names, vitamin A from the plate, and C and E are sold into no shortfall at all.

Is vitamin C worth taking every day?

Not from a tub for almost anyone: the national survey finds vitamin C short in almost no group, the trials in the replete find nothing for it beyond a modest shortening of colds in people under heavy physical stress such as endurance athletes, and the excess of a water-soluble vitamin is excreted rather than used, so that a daily high-dose vitamin C is expensive urine with an authorised claim attached; it is the vitamin the shelf sells hardest and the one that fails the sort earliest, on the benefit side, and a plate with fruit and vegetables supplies it without a tub.

Can you take too many vitamins?

Yes, of the fat-soluble ones and of one water-soluble one: vitamins A, D, E and K are stored in the liver and fat and accumulate when intake runs ahead of need, so vitamin A in excess is a known harm and never taken in pregnancy, vitamin D at many times the advice's dose crosses its upper level, and vitamin E at high doses has a trial record of harm; among the water-soluble vitamins B6 is the exception, damaging the peripheral nerves at the doses some high-strength products contain when taken over time, with slow and sometimes incomplete recovery, which is why every product's dose is read against the UK upper level before the claim.

Do I need a B complex supplement?

Rarely: the eight B vitamins are supplied by any varied plate and the survey finds a shortfall only for B12 on a diet with no animal foods, riboflavin in some young women and the dairy-free, and folate before and in early pregnancy, each of which is corrected by its own single vitamin at the dose the shortfall needs; a B complex gives the other five at doses no one was short of and often gives B6 at a dose above its upper level, which is the one B vitamin with a harm record at the shelf's doses, so the person who needs one B vitamin buys that one and reads the B6 line on any complex before buying it.

Is this site's magnesium a vitamin worth taking?

It is not a vitamin, and it is placed outside the thirteen as a mineral on a plate reading: 1500mg magnesium bisglycinate stated as 300mg elemental at 80% NRV, two capsules with the evening meal, below the supplemental upper level, with authorised claims for normal muscle function and the reduction of tiredness and fatigue, batch tested for four metals, UK made under GMP and BRC, at 22p a day, worth a tub for the share of adults the survey finds short of nuts, seeds, pulses, whole grains and greens and not for anyone whose plate is full of them, which a few days of counting settles, with a pharmacist's spacing on any medicine.

Sources

1. The UK National Diet and Nutrition Survey: a substantial minority of women of reproductive age have low iron stores and intakes below the reference, a large share of adults have low vitamin D status in winter, iodine intakes are low in young women, and magnesium intakes fall below the reference in many adults, with B12 deficiency concentrated in older adults, vegans and those on metformin or acid suppressants. https://www.gov.uk/government/collections/national-diet-and-nutrition-survey
2. The GB claims register, vitamin D entries: vitamin D contributes to normal bones, teeth, muscle function, immune function and calcium absorption, with UK guidance suggesting 10 micrograms daily in autumn and winter. https://www.gov.uk/government/publications/great-britain-nutrition-and-health-claims-nhc-register
3. The UK Expert Group on Vitamins and Minerals safe upper levels report and EFSA tolerable upper intake levels: the vitamins and minerals that accumulate or cause harm with daily long-term intake are the fat-soluble vitamins A and D, iron, zinc, selenium and vitamin B6, each with a defined upper level, against which a fibre-and-protein food extract has no comparable mechanism of accumulation. https://www.food.gov.uk/research/safe-upper-levels-for-vitamins-and-minerals
4. The vitamin B6 toxicity literature and the 2023 EFSA upper level: long-term high-dose vitamin B6 causes a sensory peripheral neuropathy with numbness and tingling that reverses slowly or incompletely on stopping, with cases reported from supplements at tens of milligrams a day over months, prompting EFSA to lower the tolerable upper intake level to 12mg a day for adults. https://efsa.onlinelibrary.wiley.com/doi/10.2903/j.efsa.2023.8006

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