Multivitamin vs single vitamin: when does one beat the other?
Three questions to settle between a broad multivitamin and a targeted single vitamin. With concrete cases.
The 'shotgun' approach (broad multivitamin) or the 'sniper' approach (targeted single vitamin): not the same philosophy, and each has its indications.
Choose a targeted single vitamin if you have a deficiency confirmed by a blood panel (iron, vitamin D - B12); choose a broad multivitamin if your diet is varied and you just want baseline insurance. In practice, adherence often decides: two capsules once a day beat three poorly-taken bottles.
| Criterion | Broad multivitamin | Targeted single vitamin |
|---|---|---|
| Indication | Baseline insurance, varied diet | Deficiency confirmed by blood panel |
| Dosage | 100% NRV spread | High corrective dose on one active |
| Adherence | Excellent (one dose) | Lower if several bottles |
| Example | Man 28, decent diet | Woman 35, ferritin 15 ng/ml |
Criterion 1: do you have a deficiency confirmed by a panel?
If yes (low ferritin, vitamin D <30 nmol/L, borderline B12), a correctly dosed single vitamin is more relevant. A 100% NRV multivitamin + a confirmed deficiency = too little to correct it.
Criterion 2: do you have a diverse diet?
If yes, you probably only need a baseline 'insurance', a broad 100% NRV multivitamin does the job without unbalancing anything.
Criterion 3: how much are you willing to manage?
Three bottles, three doses, three reminders: adherence drops. A multivitamin in two capsules once a day beats three poorly-taken single vitamins.
Concrete case 1: woman 35, ferritin 15 ng/ml
Priority: a single iron vitamin (bisglycinate 25 mg) for 3 months with ferritin monitoring. The multivitamin takes over for maintenance.
Concrete case 2: man 28, moderate sport, decent diet
100% NRV multivitamin in the morning. Sufficient. No need for single vitamins.
Concrete case 3: senior 68, vegan, wintertime
Multivitamin + sublingual B12 1000 µg/week + D3 25 µg/day in winter. The sum creates the robustness.
Go deeper
À lire aussi
Frequently asked questions
Is a multivitamin or a single vitamin better?
Choose a targeted single vitamin if you have a deficiency confirmed by a panel (iron, vitamin D, B12); choose a broad multivitamin if your diet is varied and you want baseline insurance.
When is a single vitamin preferable?
When a deficiency is confirmed by a blood test: a 100 % NRV multivitamin is too little to correct low ferritin or vitamin D <30 nmol/L. A correctly dosed single vitamin is then more relevant.
Are several supplements better than a multivitamin?
Not necessarily: adherence often decides. A multivitamin in two capsules once a day beats three poorly-taken single vitamins. Regularity beats theoretical precision of intake.