Why Probiotic Survival and Bioavailability Matter

From manufacturing to the gut: the journey of a probiotic formulation

A probiotic formulation that does not deliver viable organisms to relevant sites within the gastrointestinal tract cannot exert any biological effect regardless of its theoretical rationale. This makes the question of probiotic survival — through manufacturing, storage, and gastric transit — a central concern in formulation science.

Challenges during manufacturing and storage

Many probiotic organisms, particularly live bacterial strains, are sensitive to heat, moisture, and oxygen. The manufacturing process introduces stresses including temperature exposure during drying and encapsulation. Storage conditions — including temperature, humidity, and light — further affect viability over the product shelf life.

Formulation decisions including the choice of excipients, protective coatings, encapsulation technology, and packaging directly affect how well organisms survive between manufacture and consumption. Different strains also have very different intrinsic stability characteristics.

Gastric transit and delivery

After consumption, organisms face the acidic environment of the stomach and the bile salts present in the upper small intestine. Only organisms that can survive these conditions — either through intrinsic resilience or via protective delivery systems — reach the lower gastrointestinal tract where they may interact with the existing microbiome and host tissues.

Enteric coatings and microencapsulation approaches have been developed to improve gastric survival. The effectiveness of different approaches varies by strain and formulation design.

The WellThesis approach

At WellThesis, bioavailability and survival are explicit evaluation criteria in our formulation framework. We evaluate manufacturing feasibility and stability as part of a multi-dimensional assessment that also considers the biological rationale, safety profile, dose feasibility, and real-world product experience. Our approach is not to select ingredients based on marketing potential and then evaluate their manufacturability — we consider these questions together from the outset.