The short answer
No supplement ‘boosts’ the immunity of a healthy person. Two nutrients do, however, have a documented effect: vitamin D, which slightly reduces the risk of respiratory infections, especially in people who are deficient, and zinc when intakes are insufficient. The brands’ immunity packs save you 14 to 15% compared with buying the same products separately, but they add ingredients with weaker evidence. Our advice: a vitamin D on its own in winter costs less and covers the essentials.
The packs compared
| Pack | Contents | Pack price | Separate price | Saving |
|---|---|---|---|---|
| Dynveo, Programme Immunité | vitamin D3 1,000 IU, zinc bisglycinate 10 mg, organic reishi 200 mg (60 capsules of each) | 41.90 EUR | 48.70 EUR | 14% |
| Novoma, Routine Défenses Immunitaires | vitamin D3 2,000 IU, Quali-C vitamin C, probiotics | 42.24 EUR | 49.70 EUR | 15% |
| Nat&Form, Pack Immunité | liposomal zinc, probiotics, organic herbal ampoules | 40.50 EUR on promotion | 47.70 EUR | 15% |
The three packs cost roughly the same, around 41 EUR, and save roughly the same amount, 7 EUR. What sets them apart is what they contain, and not all the ingredients are equal.
What the science establishes, ingredient by ingredient
Vitamin D: the only demonstrated preventive effect
A meta-analysis of 25 trials with nearly 11,000 participants, published in the BMJ, shows that vitamin D supplementation reduces the risk of acute respiratory infection, with a stronger effect in people who are very deficient and when taken daily or weekly (Martineau et al., 2017, PMID 28202713). In France, a good part of the population lacks vitamin D at the end of winter. Dynveo and Novoma contain it; Nat&Form does not.
Zinc: useful if you are short of it
Zinc contributes to the normal function of the immune system, which is an authorised claim. As a supplement it is only worthwhile if your diet does not provide enough, which mainly concerns vegetarian diets. Dynveo (10 mg of bisglycinate) and Nat&Form (liposomal zinc) contain it; our zinc comparison compares prices and forms.
Vitamin C: no prevention for most people
The Cochrane review on vitamin C and the common cold concludes that regular intake does not reduce the number of colds in the general population; it shortens their duration slightly, and prevents colds only in people under intense physical stress (Hemilä and Chalker, 2013, PMID 23440782). A diet with fruit and vegetables provides enough.
Reishi, herbs, probiotics: weaker evidence
Dynveo’s reishi, Nat&Form’s herbal ampoules and the probiotics from Novoma and Nat&Form rest on less solid data for preventing infections in healthy adults. They are not dangerous products, but they are what makes up most of the packs’ price.
Our choice: vitamin D alone, or the most targeted pack
If you want just one thing this winter, take a vitamin D: our vitamin D comparison shows that it costs only a few cents a day.
If you prefer a pack, Dynveo’s brings together the two best-supported ingredients, vitamin D and zinc, with reishi on top. Novoma’s is the only one to provide 2,000 IU of vitamin D, but it replaces zinc with vitamin C and probiotics. Nat&Form’s contains no vitamin D.
Medical advice is needed before prolonged high-dose vitamin D supplementation, and if you have a chronic illness or are on treatment.
Our sources
- Official Dynveo, Novoma and Nat&Form pages, consulted on 23/10/2026: pack contents and prices.
- Martineau A.R. et al., Vitamin D supplementation to prevent acute respiratory tract infections, BMJ, 2017 (PMID 28202713).
- Hemilä H., Chalker E., Vitamin C for preventing and treating the common cold, Cochrane Database of Systematic Reviews, 2013 (PMID 23440782).