The Top 5 Immunity Supplements: What the Science Says
This article is for informational purposes only and does not constitute medical advice. These products are food supplements and are not intended to diagnose, treat, cure, or prevent any disease. Consult your GP or a qualified healthcare professional if you have any concerns about your immune health.
Supporting your immune system is one of the most common reasons people turn to nutritional supplements — and with good reason. Certain vitamins, minerals, and botanicals have a well-established evidence base for contributing to the normal function of the immune system. Here are our top 5, chosen for their quality, research backing, and the products we stock at Elixir Health & Wellbeing.
1. Vitamin D
Vitamin D is arguably the most important immune-supporting nutrient for people living in the UK. Vitamin D contributes to the normal function of the immune system — an authorised health claim backed by extensive research. Yet the majority of the UK population is deficient, particularly during autumn and winter when sunlight levels are insufficient for the skin to synthesise it.
Public Health England recommends that everyone consider a daily Vitamin D supplement of 10µg (400IU) during autumn and winter. Our range includes options for every need:
- Viridian Vitamin D3 400IU, 1000IU & 2000IU — vegan, plant-sourced from lichen, in certified organic capsules
- Solgar Vitamin D3 4000IU — a higher-strength option for those with confirmed deficiency (seek medical advice before taking high-dose Vitamin D)
- Viridian Vitamin D3 & K2 — combines Vitamin D3 with Vitamin K2 (MK-7) for synergistic bone and immune support
- Viridian Liquid Vitamin D3 2000IU — ideal for those who prefer a liquid format or have difficulty swallowing capsules
Suggested use: 1 capsule or as directed daily, ideally with a meal containing fat as Vitamin D is fat-soluble.
2. Vitamin C
Vitamin C contributes to the normal function of the immune system — one of the most well-known and widely supported nutritional health claims. It also contributes to the protection of cells from oxidative stress and to the reduction of tiredness and fatigue.
Our range includes:
- Viridian Extra C 550mg & 950mg — high-potency Vitamin C with lipid metabolites for enhanced bioavailability and rapid absorption
- Solgar Vitamin C 1000mg with Rose Hips — a classic high-strength formula with added bioflavonoids from rose hips
- Viridian Vitamin C & Zinc — combines Vitamin C with Zinc for dual immune support (see below)
Suggested use: 1 capsule or tablet daily. Vitamin C is water-soluble, so excess is excreted — splitting the dose throughout the day may improve absorption at higher intakes.
3. Zinc
Zinc contributes to the normal function of the immune system and to the protection of cells from oxidative stress. It also contributes to normal DNA synthesis and normal cognitive function. Zinc is an essential mineral that many people don’t get enough of from diet alone, particularly those following plant-based diets.
Viridian Vitamin C & Zinc combines both nutrients in a single convenient capsule, making it an efficient choice for everyday immune support.
Suggested use: 1 capsule daily with food. Do not exceed the recommended dose as excessive zinc intake can interfere with copper absorption.
4. Echinacea
Echinacea (Echinacea purpurea) is one of the most widely used herbal supplements in the world, with a long tradition of use in herbal practice. A.Vogel Echinaforce is a Traditional Herbal Registration (THR) licensed product — one of the few herbal supplements to have undergone formal MHRA assessment for quality and safety.
Available as both drops and tablets, Echinaforce is made from freshly harvested, organically grown Echinacea purpurea herb and root, used within 24 hours of harvest. Research suggests that fresh plant extracts contain significantly more active compounds than dried herb equivalents.
Suitable for adults and children over 12 years. Not recommended during pregnancy or breastfeeding.
Suggested use: As directed on the pack. Always read the label.
5. Probiotics
The gut is home to approximately 70% of the body’s immune cells, making gut health central to immune function. A growing body of research supports the role of specific probiotic strains in maintaining a healthy gut microbiome and supporting immune resilience.
Optibac For Every Day EXTRA Strength contains 5 extensively researched strains — including Lactobacillus acidophilus NCFM® and Bifidobacterium bifidum Bb-02 — at a dose of 20 billion live microorganisms per capsule. Dairy-free, vegan, and suitable for adults and children from 1 year upwards.
For babies and young children, Optibac Baby Drops contain Bifidobacterium breve M-16V®, suitable from birth.
Suggested use: 1–2 capsules daily with food, preferably at breakfast.
Honourable Mention: Ashwagandha
Ashwagandha (Withania somnifera) is an adaptogenic herb traditionally used to support the body’s resilience to everyday stress. Chronic stress is known to suppress immune function, making adaptogens a useful complementary addition to an immunity-focused supplement routine. Viridian Organic Ashwagandha is certified organic by the Soil Association and standardised to a minimum of 5% withanolides.
Building an Immunity Routine
The most effective approach to immune support combines a nutrient-rich diet, regular exercise, quality sleep, stress management, and targeted supplementation. Start with the foundations — Vitamin D and Vitamin C — and layer in additional support based on your individual needs and lifestyle.
As always, consult your GP or a qualified healthcare professional before starting new supplements, particularly if you are pregnant, breastfeeding, or taking prescribed medication.
