Different materials need different checks
A live-culture product contains microorganisms. Review their identity, the stated viable count, storage conditions and evidence relevant to the proposed use. The word probiotic requires more than the presence of live organisms.
A prebiotic is a substrate used selectively by microorganisms in a way that benefits the host. Some dietary fibres meet this definition; fermentability alone is insufficient.
Evaluate a combination on its own evidence
Putting a fibre and a live culture in one formula does not establish a benefit for that combination. Review the composition, stability and supporting studies for the finished preparation.
For any product under development, confirm the final information before choosing it or planning a purchase. This comparison describes ingredient categories, rather than the composition or availability of a named Fybrance product.