Supplements for immune support
Vitamin D3, zinc picolinate, vitamin C, Immunomax and elderberry: the authorised claims, and why nothing here boosts anything.
How to choose an immune support supplement
The immune system is not boosted, and this page does not say it is. Vitamin D, zinc and vitamin C contribute to its normal function, which is the honest claim and the useful one.
Why these
Vitamin D3 & K2: For October to March; vitamin D contributes to the normal function of the immune system.
Zinc Picolinate Capsules: Zinc contributes to the normal function of the immune system.
Vitamin C Ascorbic Acid Powder: Vitamin C contributes to the normal function of the immune system.
Immunomax: The immune formula, with zinc, vitamin C and elderberry.
Elderberry Immune Support Capsules: Elderberry capsules, described as elderberry.
What to skip
Anything with the word boost on it, and megadoses of vitamin C, which the trials do not support.
Read the evidence
How long does vitamin D take to work? · Zinc and copper: the balance
If you take prescribed medicines, are pregnant or breastfeeding, or have a diagnosed condition, talk to your GP or pharmacist first. Not sure which fits? Ask Nutri365, the Nutri Tailor AI health expert, which checks for interactions and contraindications.
Written by Nutri Tailor from the Health Reference Library. Last checked 6 September 2026. General information, not personal advice.
Common questions
Can a supplement boost the immune system?
No. The authorised claims are that vitamin D, zinc and vitamin C contribute to the normal function of the immune system. Boosting is not a claim any of them can make.
How much vitamin D should I take in winter?
UK guidance is 10 micrograms (400 IU) a day for most adults from October to March. Higher doses are for people with a low result, guided by a test.
Do high doses of vitamin C prevent colds?
The trials do not support that for most people. Regular intake shortened colds slightly; megadoses at the first sniffle did not.
Written by Nutri Tailor from the Health Reference Library. Last checked 6 September 2026. General information, not personal advice.