Saccharomyces Boulardii UK – 5 Billion CFU Yeast Biotic 30 Caps

Almost every probiotic on the market is bacteria. This one isn't. Saccharomyces boulardii is a yeast — which means it is not affected by antibiotics, unlike bacterial probiotics. 5 billion CFU per capsule, with olive leaf extract, vitamin D3 and biotin.

A Yeast, Not a Bacterium — and That's the Point

Saccharomyces boulardii was first isolated from lychee and mangosteen fruit. It differs greatly from the better-known probiotic species such as acidophilus and bifidobacterium.

The practical consequence: antibacterial agents and antibiotics don't affect it. Bacterial probiotics taken alongside a course of antibiotics are working against the medication; a yeast is not. That is why S. boulardii is the strain people reach for during and after antibiotics, and when travelling.

It is also hardy, acid-resistant and temperature-tolerant — stable at room temperature with no refrigeration required.

The Nutrients Carry the Claims

Vitamin D3 — 2.75µg / 110iu (55% NRV) · contributes to the normal function of the immune system, normal absorption and utilisation of calcium and phosphorus, normal blood calcium levels, and the maintenance of normal bones, muscle function and teeth.

Biotin — 8µg (16% NRV) · contributes to normal energy-yielding metabolism, normal nervous system function, normal macronutrient metabolism, normal psychological function, normal hair and skin, and the maintenance of normal mucous membranes — which includes the gut lining.

The olive leaf extract at 150mg equivalent is standardised to provide 0.60mg of oleuropein, its characteristic compound.

How Other UK Probiotics Compare

Bacterial probiotics — affected by antibiotics. Acidophilus and bifidobacterium products are excellent for general flora support, but they are bacteria, so a course of antibiotics works against them.

Optibac Saccharomyces boulardii — the best-known UK option. A good product and the category reference, without olive leaf, vitamin D3 or biotin, and no halal certification.

High-CFU bacterial blends — more strains, different job. Products at 20 or 50 billion CFU across many strains do broad flora work rather than the specific role a yeast plays.

What's in Every Capsule

EU-authorised vitamin claims:

• Vitamin D3 — 2.75µg / 110iu (55% NRV) · normal immune function · normal absorption of calcium and phosphorus · normal blood calcium levels · maintenance of normal bones, muscle function and teeth · a role in cell division
• Biotin — 8µg (16% NRV) · normal energy-yielding metabolism · normal nervous system function · normal macronutrient metabolism · normal psychological function · normal hair and skin · maintenance of normal mucous membranes

The biotic and botanical:

• Saccharomyces boulardii — 250mg, equivalent to 5 billion CFU · a non-pathogenic tropical yeast, originally isolated from lychee and mangosteen fruit
• Olive leaf — 150mg equivalent, containing 0.60mg oleuropein · Olea europaea

30 capsules in an HPMC vegetarian shell, in a base of stoneground brown rice flour. Vegan. Vegetarian. Halal approved. Kosher approved. Stable at room temperature — no refrigeration required, though it may be refrigerated to preserve freshness.

Sourcing note: the Saccharomyces boulardii does not originate from the UK.

Every capsule is: ✓ 5 billion CFU yeast biotic ✓ Unaffected by antibiotics · ✓ Vitamin D3 55% NRV · ✓ No fridge needed · ✓ Halal & kosher · ✓ Vegan

SaccharoMyTum vs Other UK Probiotics

Based on publicly available product information. Always verify current specs on manufacturer websites.

How to Take It

Take 1 capsule, one to three times per day before meals, or as advised. Up to 6 capsules per day.

Stable at room temperature, so no fridge needed — which makes it practical for travel. It may be refrigerated to preserve freshness. Each pot contains a small food-grade moisture sachet; this is not to be eaten.

For bacterial flora support alongside or afterwards, BioTic 4 Billion provides 8 strains, and BioTic 20 Billion five times that.

Is This You?

• You're taking or have just finished a course of antibiotics — a yeast biotic isn't affected by them, bacterial ones are
• You're travelling and want something that doesn't need a fridge
• You want vitamin D3 and biotin alongside, not a single-ingredient product
• You need halal and kosher approved — Optibac and most competitors carry neither
• You've used bacterial probiotics and want to try a different mechanism

Explore the full Gut Health UK and Halal Vitamins UK collections.

Questions We Get Asked

Food supplements should not replace a varied diet or healthy lifestyle. Contains a moisture sachet which must not be eaten. Consult your GP before use if pregnant, breastfeeding, taking prescription medication, immunocompromised, critically ill, or if you have a central venous catheter.