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 1000IU (Vegan) — plant-sourced from lichen, in certified organic capsules
- Viridian Vitamin D3 2000IU (Vegan) — higher strength for autumn and winter top-up
- Vitamin D3 4000IU — a higher-strength option for those with confirmed deficiency (seek medical advice before taking high-dose Vitamin D)
- Vitamin D3 & K2 — combines 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 — high-potency Vitamin C with lipid metabolites for enhanced bioavailability
- Viridian Extra C 950mg — maximum-strength option for immune seasons
- Viridian Vitamin C & Zinc — combines Vitamin C with Zinc for dual immune support
Suggested use: 1 capsule daily. Vitamin C is water-soluble — 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 supports normal DNA synthesis and cognitive function. Many people don't get enough zinc from diet alone, particularly those following plant-based diets.
- Viridian Vitamin C & Zinc — combines both nutrients in a single convenient capsule
- Viridian Beta Glucan Complex (with Vitamin C, D3 & Zinc) — a comprehensive immune formula combining four key nutrients
Suggested use: 1 capsule daily with food. Do not exceed the recommended dose as excessive zinc can interfere with copper absorption.
4. Echinacea
Echinacea (Echinacea purpurea) is one of the most widely used herbal supplements for immune support, with a long tradition in herbal practice.
- A.Vogel Echinaforce Forte — a Traditional Herbal Registration (THR) licensed product, one of the few herbal supplements to have undergone formal MHRA assessment for quality and safety. Made from freshly harvested, organically grown Echinacea purpurea herb and root
- Viridian Echinacea Veg Caps — a certified organic echinacea option
- Viridian Organic Echinacea Tincture — liquid format for rapid absorption
Suitable for adults and children over 12. Not recommended during pregnancy or breastfeeding.
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 — 5 extensively researched strains at 20 billion live microorganisms per capsule. Dairy-free, vegan, suitable from 1 year upwards
- Optibac For Those on Antibiotics — targeted support during and after antibiotic courses
- Optibac For Travelling Abroad — ideal for immune support on the go
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 — certified organic by the Soil Association, 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.
