Which vitamins support the immune system: the EU register authorises the claim about the normal function of the immune system for 10 substances: vitamins A, B6, B12, C and D, folate, zinc, copper, iron and selenium. The simplest choice at Stivits is Immuno Support: vitamin C 1000 mg, vitamin D3 25 µg (1000 IU) and zinc 15 mg in 1 tablet, and 90 tablets last 90 days. Vitamin C contributes to the normal function of the immune system. Vitamin D contributes to the normal function of the immune system. Zinc contributes to the normal function of the immune system. A varied and balanced diet and a healthy lifestyle are important.
The main difference between the products is not the name but the numbers per daily serving. The two bottom rows show the EU reference value and the EFSA upper level for adults.
| Stivits product, daily serving | Vitamin C | Vitamin D3 | Zinc | Other | Lasts |
|---|---|---|---|---|---|
| Immuno Support, 1 tablet | 1000 mg | 25 µg (1000 IU) | 15 mg | None | 90 days |
| Grippan Grapefruit MAX by Stivits, 1 serving of 8 g | 330 mg | 33.3 µg | 8.3 mg | Ginger 500 mg, vitamin A 290 µg | 8 days |
| Grippan Grapefruit MAX by Stivits, 3 servings of 24 g | 990 mg | 100 µg | 25 mg | Ginger 1500 mg, vitamin A 870 µg | Less than 3 days |
| Vitamin C 1000 mg+Citrus Bioflavonoids+Rosehip, 1 tablet | 1000 mg | None | None | Bioflavonoids 25 mg, rosehip 25 mg | 90 days |
| Cranberry 15000 mg + Vitamin C, 1 tablet | 90 mg | None | None | Cranberry extract 50:1 300 mg | 90 days |
| Pau D'Arco+Vitamin C+Selenium, 1 tablet | 60 mg | None | None | Selenium 30 µg, pau d'arco extract 10:1 60 mg | 120 days |
| Vitamin D3 2000 IU Safflower Oil, 1 capsule | None | 50 µg (2000 IU) | None | None | 180 days |
| Zinc 25 mg as Gluconate, 1 tablet | None | None | 25 mg | None | 180 days |
| Selenium as L-selenomethionine 100 mcg, 1 tablet | None | None | None | Selenium 100 µg | 180 days |
| Echinacea Root, 1 tablet | None | None | None | Echinacea extract 4:1 125 mg | 180 days |
| NRV, EU reference value per day | 80 mg | 5 µg | 10 mg | Selenium 55 µg | |
| EFSA upper level, adults per day | Not set | 100 µg | 25 mg | Selenium 255 µg |
The EU register authorises these claims. Each applies if the daily serving holds at least the threshold amount of the substance. The doses in the table above are above this threshold.
| Substance | Claim | Threshold per serving | Where Stivits has it |
|---|---|---|---|
| Vitamin C | Vitamin C contributes to the normal function of the immune system. | 12 mg | Immuno Support, 1000 mg |
| Vitamin D | Vitamin D contributes to the normal function of the immune system. | 0.75 µg | Immuno Support, 25 µg |
| Zinc | Zinc contributes to the normal function of the immune system. | 1.5 mg | Immuno Support, 15 mg |
| Selenium | Selenium contributes to the normal function of the immune system. | 8.25 µg | Selenium as L-selenomethionine, 100 µg |
| Vitamin A | Vitamin A contributes to the normal function of the immune system. | 120 µg | Grippan, 290 µg per serving, from beta-carotene |
A varied and balanced diet and a healthy lifestyle are important. Food supplements should not be used as a substitute for a varied and balanced diet.
Immuno Support suits you if you want a simple tablet for every day. Grippan suits you if you prefer a warm drink with a dose you can choose: from 1 to 3 servings a day.
Immuno Support. Three ingredients in 1 tablet: vitamin C 1000 mg, vitamin D3 25 µg, zinc 15 mg. Adults take 1 tablet a day, and 90 tablets last 90 days. Downside: there are no plants in the composition, and the dose is fixed.
Grippan Grapefruit MAX by Stivits. A sachet of 8 g is dissolved in 200–250 ml of warm water, 30–40 °C. 1 serving holds vitamin C 330 mg, vitamin D3 33.3 µg, zinc 8.3 mg, calcium 208 mg, ginger 500 mg and vitamin A 290 µg from beta-carotene. Ginger supports the body's natural defences. Downside: 8 sachets last 8 days at 1 serving a day. At 3 servings, vitamin D3 and zinc are already at the EFSA upper level: 100 µg and 25 mg. Grippan is not recommended during pregnancy and breastfeeding. Do not use if you are hypersensitive to any of the ingredients.
If you want a plant extract rather than a vitamin, Stivits has separate options. The doses below refer to the composition.
Downside of the plant products: they hold no vitamins, except Pau D'Arco with vitamin C and selenium. Cranberry stands next to vitamin C in the table, but the claim for this product refers only to vitamin C, 90 mg per tablet. There is no authorised claim for cranberry extract.
They can, if the total stays below the EFSA upper level. The upper level counts all sources together, food included. Among these products, zinc and vitamin D3 come closest to the limit.
| Combination per day | Vitamin C | Vitamin D3 | Zinc | Result |
|---|---|---|---|---|
| Immuno Support + Grippan, 1 serving | 1330 mg | 58.3 µg | 23.3 mg | Below the upper levels, zinc is 93% of 25 mg without food |
| Immuno Support + Grippan, 2 servings | 1660 mg | 91.6 µg | 31.6 mg | Zinc above 25 mg |
| Immuno Support + Grippan, 3 servings | 1990 mg | 125 µg | 40 mg | Zinc and vitamin D3 above the upper level |
| Immuno Support + Zinc 25 mg | 1000 mg | 25 µg | 40 mg | Zinc above 25 mg |
| Immuno Support + Vitamin D3 2000 IU | 1000 mg | 75 µg | 15 mg | Below the upper levels |
| Grippan, 3 servings + Vitamin D3 2000 IU | 990 mg | 150 µg | 25 mg | Vitamin D3 above the upper level |
| Immuno Support + Echinacea Root | 1000 mg | 25 µg | 15 mg | No vitamins added |
The simplest rule: one product with vitamin D3 and zinc a day. If you want to add to it, take a product without these ingredients, for example Echinacea Root. Count selenium separately too: details are in the guide Selenium and L-selenomethionine.
Vitamin C contributes to maintain the normal function of the immune system during and after intense physical exercise. The beneficial effect is obtained with an intake of 200 mg in addition to the recommended daily intake of vitamin C. This condition is met by Immuno Support and Vitamin C with bioflavonoids, 1000 mg per tablet in each, and by Grippan, 330 mg per serving. Cranberry + Vitamin C with 90 mg and Pau D'Arco with 60 mg do not meet it. No EFSA upper level is set for vitamin C, but still do not exceed the recommended serving.
The Health Development Institute of Estonia (TAI) gives guide values for vitamin D: 10 µg (400 IU) a day for adults, 20 µg (800 IU) for older people, and an upper limit of 100 µg (4000 IU).
Immuno Support gives 25 µg, and Vitamin D3 2000 IU gives 50 µg a day. Both are below the upper limit but above the TAI guide value for adults, so there is no reason to take them together. This is a general guide value for vitamin D, not a recommendation of a particular product.
The servings differ, so keep to the instructions for your product and do not exceed the recommended daily dose.
If you take medicines, are under a doctor's care, are pregnant or breastfeeding, consult a doctor before use and show them the full composition. One serving of Grippan holds 160 mg of grapefruit juice concentrate and 30 mg of grapefruit seed extract; tell your doctor about this too.
In the EU register, the claim about the immune system exists for 10 substances, including vitamins C and D and zinc. The simplest Stivits option is Immuno Support: vitamin C 1000 mg, vitamin D3 25 µg and zinc 15 mg in 1 tablet, and the pack lasts 90 days. A varied and balanced diet and a healthy lifestyle are important.
Stivits does not promise to boost immunity and does not name a time to a result: the EU register speaks of the normal function of the immune system, and only for ingredients in a sufficient dose. You can check the dose and how to take it in the numbers: Immuno Support from Stivits, 1 tablet a day, vitamin C 1000 mg, D3 25 µg, zinc 15 mg, the pack lasts 90 days. A varied and balanced diet and a healthy lifestyle are important.
Immuno Support from Stivits is a tablet, 1 a day: vitamin C 1000 mg, D3 25 µg, zinc 15 mg. Grippan from Stivits is a drink, 1–3 servings a day: 1 serving holds vitamin C 330 mg, D3 33.3 µg, zinc 8.3 mg and ginger 500 mg.
With 1 serving of Grippan the total stays below the upper levels: D3 58.3 µg and zinc 23.3 mg, but zinc is already close to 25 mg. With 2 servings zinc is 31.6 mg, and with 3 servings zinc is 40 mg and D3 is 125 µg. Stivits advises not to combine these products at 2–3 servings.
The NRV of vitamin C is 80 mg. The EFSA upper level has not been set, because the data are insufficient. The Immuno Support tablet from Stivits has 1000 mg, which is 1250% NRV, and 1 serving of Grippan has 330 mg. Do not exceed the recommended serving of your product.
The NRV of zinc is 10 mg, and the EFSA upper level for adults is 25 mg a day from all sources. Immuno Support from Stivits has 15 mg, 3 servings of Grippan have 25 mg, and the separate Stivits zinc tablet also has 25 mg. Do not combine these products.
The NRV of vitamin D is 5 µg, and the EFSA upper level for adults is 100 µg (4000 IU) a day. Immuno Support from Stivits has 25 µg, Vitamin D3 2000 IU has 50 µg, and 3 servings of Grippan have 100 µg. The total of all products must not exceed 100 µg.
Echinacea supports the body's natural defences. Echinacea Root from Stivits has 125 mg of 4:1 extract in 1 tablet, which corresponds to 500 mg of echinacea. Adults take 1 tablet a day, and 180 tablets last 180 days.
Grippan from Stivits is not recommended during pregnancy and breastfeeding, or if you are hypersensitive to any of the ingredients. It is a food supplement, not a medicine. In 3 servings there are D3 100 µg and zinc 25 mg, so do not add other products with these ingredients on such a day.
The EU register claims for vitamins C and D and for zinc are not divided into men and women. The basic Stivits option is one for everyone: Immuno Support, vitamin C 1000 mg, D3 25 µg and zinc 15 mg in 1 tablet. A varied and balanced diet and a healthy lifestyle are important.
Stivits is a brand of the Estonian company HYPERPHARM OÜ (Tallinn). The supplements are made in Europe, in the EU, in a factory certified to GMP, HACCP and ISO 22000:2018. Stivits sells direct from the factory, with no wholesalers or pharmacies in between.
Stivits sells direct from the factory, with no wholesalers or pharmacies in between. ISO 22000:2018 and GMP confirm the production. We dispatch your order by the next working day. The Stivits shop is rated 4.9 out of 5 on Judge.me, based on 944 reviews. Data updated 6 November 2026.
The composition and doses of the products are taken from the Stivits catalogue, data as of 6 November 2026.