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The VSL® Probiotics Difference

The VSL® Probiotics Difference

Legacy You Trust. Results That Deliver.

Our Purpose: Science That Serves People

Microbiome health isn’t one-size-fits-all — and neither are we.

VSL® Probiotics exists to bridge the gap between scientific discovery and everyday wellbeing. We develop precision-formulated probiotics grounded in a legacy of microbiome research, helping people manage complex digestive conditions and support their daily gut and vaginal health.

From VSL#3®, a gold-standard medical food trusted by healthcare professionals and customers worldwide, to innovative supplements like VSL4® Gut and VSL4® Vaginal Health, we’re guided by one goal: to empower better health through probiotic science that delivers real-world results.*

Our formulations are built on the highest standards of potency, quality, and reliability. Backed by scientific and clinical research, VSL® Probiotics continues to lead the way in advancing microbiome science for both clinical use and everyday wellness.

The VSL® Difference: Proven. Precise. Trusted.

VSL® Probiotics builds on the legacy of VSL#3® — a formulation trusted by healthcare professionals for its quality, consistency, and reliability. That same foundation guides every product in the VSL® Probiotics family, from clinically studied medical foods to precision-formulated daily supplements.

Our focus remains the same: creating probiotic formulations grounded in evidence, crafted with precision, and respected for their consistency — not driven by trends, but by trust earned through experience.

Science Over Hype.Purpose Over Promises.

Built on the legacy of VSL#3® — a probiotic trusted by healthcare professionals and recognized for its scientific rigor — VSL® Probiotics continues to advance microbiome science through targeted, high-quality formulations that support both clinical dietary management and everyday wellness.
For us, potency isn’t a number — it’s a principle. Every VSL® Probiotics formulation is developed with meaningful levels of live bacteria, manufactured under controlled conditions, and verified to maintain the labeled CFU count through expiration when stored as recommended.Potency matters because probiotic function depends on both the quantity and vitality of live organisms that reach the gut. Even modest loss over time can affect performance, which is why every VSL® Probiotics product is designed and tested to deliver consistent strength from first dose to last.

Committed to Potency

Potent probiotic formulations guaranteed to maintain labeled CFU counts through expiration.

For probiotics to work, live microorganisms must survive both storage and digestion to reach the gut intact. Every VSL® Probiotics formulation is developed with this in mind — combining carefully selected strains, stability-enhancing formulation design, and packaging to maintain viability from manufacturing through expiration.VSL#3® is maintained under strict cold-chain conditions — refrigerated throughout production, storage, and shipping — to help preserve live strains at their intended strength. VSL4® products are shelf-stable and formulated with acid-resistant capsules that help protect probiotic bacteria until they reach the intestinal tract.

Designed for Viability

Carefully designed formulations that help safeguard live bacteria from production to delivery.

Our formulations are grounded in science. Each strain is selected for its documented characteristics and ability to contribute meaningfully to a balanced microbiome. This approach draws on years of probiotic research — building on well-studied formulations and evidence-backed strains to create products designed for specific microbiome needs.Across the VSL® Probiotics family, every formulation follows the same principle: science guides each step, from strain selection to finished product. This consistent, evidence-based process ensures reliability and quality across the brand’s entire portfolio.

Science-Led Strain Selection

Thoughtfully formulated with complementary probiotic strains chosen for function and purpose.

VSL® Probiotics builds on the legacy of VSL#3® — a formulation long trusted by healthcare professionals for its quality and reliability. That foundation continues to guide how we develop every product in the VSL® Probiotics family. Our focus remains the same: to create formulations grounded in evidence, crafted with precision, and respected for their consistency — not driven by trends, but by trust earned through experience.

A Legacy of Expertise

A probiotic heritage recognized for its consistency, credibility, and professional trust.

What Our Customers Say

Feel the difference. Live Better.* Choose VSL® Probiotics.

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