Herbalife Immune Booster: Ingredients, Science & How to Use It
By Dogus Dilan, Herbalife Independent Wellness Coach · Last updated 13 August 2026 · 7 min read
Your immune system works quietly every day. Immune Booster is designed as a simple daily addition — mix one sachet into a glass of water and it’s done, with a berry flavour rather than a chalky tablet taste.
This guide covers exactly what’s in it, what’s officially claimed, what the underlying EpiCor® research says, and how to use it.
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What’s In It
Ingredients, taken directly from the official product label:
Maltodextrin, dried yeast fermentate EpiCor® (made using Saccharomyces cerevisiae), elderberry fruit juice powder, acidity regulator (citric acid), thickeners (acacia gum, xanthan gum), L-ascorbic acid, natural flavouring, colour (beetroot red), sweetener (steviol glycosides from stevia), zinc citrate, cholecalciferol, anti-caking agent (silicon dioxide), sodium selenite.
No allergens are declared on the official label.
Nutritional Information
Figures below are taken directly from the official product label. One sachet (3.7g) is dissolved in 150ml water.
| Nutrient | Per 150ml made-up product* | % RI** |
|---|---|---|
| Vitamin C | 80 mg | 100% |
| Vitamin D | 10 µg | 200% |
| Zinc | 3.0 mg | 30% |
| Selenium | 55 µg | 100% |
| Dried yeast fermentate (EpiCor®) | 500 mg | – |
* 1 sachet (3.7g) dissolved in 150ml water. ** RI = Reference Intake. “–” means no RI is established for EpiCor® under EU/UK food labelling rules.
What’s Officially Claimed
Herbalife’s official claims for Immune Booster are the standard, EU-authorised vitamin and mineral claims tied to the doses in the table above:
- Vitamin C, Selenium and Zinc contribute to the protection of cells from oxidative stress.
- Vitamin D contributes to the normal function of the immune system.
EpiCor® itself is described as the product’s formulated ingredient, without the finished product’s own copy attaching a specific health claim to it. As with the vitamins above, any broader picture of what EpiCor® does comes from separate, published ingredient research — covered next.
Understanding EpiCor®: What the Research Says
Herbalife publishes a separate “Behind the Science” resource on EpiCor®, which carries its own disclaimer: the content is educational, not evaluated by any regulatory body, and shouldn’t be treated as marketing material. With that distinction in mind, here’s what’s genuinely published about the ingredient:
EpiCor® is a postbiotic — a whole food fermentate made from Saccharomyces cerevisiae (the same yeast species used in baking and brewing) through a proprietary fermentation and drying process. According to Herbalife’s science resource, it’s been studied in 15 published studies (7 preclinical, 8 human clinical), including trials specifically on seasonal immune support: one placebo-controlled trial with 96 participants over 12 weeks in spring, and two placebo-controlled trials with a combined 116 participants over 12 weeks in winter. A separate placebo-controlled trial with 80 participants over 6 weeks looked at EpiCor®’s effect on the gut microbiome. It’s also confirmed gluten-free (no wheat, barley, rye or oats) and, per the same resource, no adverse effects have been reported across its published safety testing.
Why Vitamin D matters more in UK winters
Separately from EpiCor®, the UK’s NHS advises that everyone consider a daily 10 microgram vitamin D supplement between October and early March, since sunlight in the UK isn’t strong enough during those months for the body to make enough on its own. Immune Booster provides 10µg of vitamin D per sachet — in line with that recommendation.
How to Use It
Add 1 sachet (3.7g) to 150ml of water and stir until dissolved. Consume 1 glass once a day with meals. Do not exceed the recommended daily dose. Use this product within a balanced and varied diet, as part of a healthy active lifestyle. Store in a cool, dry place, out of reach of young children.
Frequently Asked Questions
What is EpiCor®?
EpiCor® is a whole food fermentate (postbiotic) made from Saccharomyces cerevisiae yeast through a fermentation and drying process. It’s a registered trademark of Embria Health Sciences, LLC.
Is Immune Booster suitable for vegans?
Yes — it’s formulated to be suitable for both vegans and vegetarians, and is gluten-free.
Do I need more vitamin D in winter?
The NHS advises everyone in the UK consider a daily 10µg vitamin D supplement between October and early March, when sunlight isn’t strong enough to produce it naturally. Immune Booster provides 10µg per sachet.
Does Immune Booster contain sugar?
It’s sweetened with steviol glycosides from stevia leaves, not sugar.
How many sachets are in a box?
21 individual sachets.
Can I take Immune Booster all year round?
The label’s instructions are for daily use (one sachet a day with meals) without a seasonal restriction; do not exceed the recommended daily dose.
Sources & References
- Herbalife Immune Booster official product label and product description, Herbalife International Luxembourg S.à r.l. / Herbalife Europe Limited (UK)
- Herbalife UK — Behind the Science: EpiCor® (educational resource, not a regulatory-evaluated claim)
- NHS — Vitamin D
- EU Register of Nutrition and Health Claims — Commission Regulation (EU) No 432/2012 (Vitamin C, D, Zinc, Selenium claims)
