What is BioGaia Gastrus?
BioGaia Gastrus is a chewable probiotic tablet containing two specific strains of Lactobacillus reuteri: DSM 17938 and ATCC PTA 6475. Each tablet provides 100 million CFU of each strain, for a combined 200 million CFU per tablet. The product is formulated as a chewable tablet with mandarin and mint flavouring, using isomalt as a base.
BioGaia is a Swedish probiotic company with a long-standing focus on Lactobacillus reuteri research. The Gastrus formulation combines two distinct L. reuteri strains into a single tablet, each identified by their specific strain designations rather than generic species labelling. The chewable format requires no water and is suitable for daily use in adults.
Why This Formulation / How It Works
BioGaia Gastrus contains two distinct Lactobacillus reuteri strains: DSM 17938 and ATCC PTA 6475. Each strain is identified by its specific culture collection designation, providing precise strain-level identification rather than species-level labelling. Each tablet delivers 100 million CFU of each strain, for 200 million CFU total per tablet. The chewable tablet format allows the strains to be released in the oral cavity and upper digestive tract as the tablet is chewed and swallowed. BioGaia has focused its product development on L. reuteri strains specifically, and the Gastrus product represents their dual-strain adult formulation. The tablet uses isomalt as its base, with mandarin and mint flavouring.
When to Consider This
This is a practitioner-grade probiotic supplement containing two Lactobacillus reuteri strains. Speak with your healthcare provider about whether it is appropriate for you.
⚠️ Not suitable for: Those who may be sensitive to isomalt (excessive consumption may produce laxative effects). Not intended to replace a varied and balanced diet.
How to Use
Chew 1 to 2 tablets daily and swallow. Each tablet provides 200 million CFU (100 million CFU per strain). Do not exceed the recommended daily dosage. Suitable for daily use in adults.
Ingredients
Per 1 tablet:
- Lactobacillus reuteri DSM 17938 — 100 million CFU
- Lactobacillus reuteri ATCC PTA 6475 — 100 million CFU
Other ingredients: Isomalt, ascorbic acid (Vitamin C), mandarin flavour, calcium stearate, mint flavour.
Allergen information: Not stated in supplied material. Consult manufacturer for full allergen details.
Common Questions
Do I need water to take this tablet?
No. Gastrus is a chewable tablet — chew it well and swallow. No water is required.
Does this product need to be refrigerated?
Store below 25°C in a cool, dry place. Refrigeration is not stated as a requirement by the manufacturer.
What is the difference between the two strains in this product?
The two strains — DSM 17938 and ATCC PTA 6475 — are distinct Lactobacillus reuteri strains identified by their specific culture collection designations. Both are included at 100 million CFU per tablet.
Warnings & Storage
Do not use if: You are sensitive to isomalt. Not specified for use in children — consult your healthcare provider regarding use in populations other than adults.
Cautions: Excessive consumption of isomalt may produce laxative effects. If symptoms persist, worsen, or change unexpectedly, consult your healthcare professional. Do not exceed the recommended daily dosage.
Storage: Store below 25°C in a cool, dry place.
Always read the label and follow directions for use. Dietary supplements should not replace a balanced and varied diet.











