Bifidobacterium longum and Bifidobacterium breve are common names on probiotic labels, but live bacteria still have to pass through the upper digestive tract before reaching the intestine. That makes the delivery format worth thinking about, especially when working with probiotic powder.
The important detail is that “Bifidobacterium” is not one uniform ingredient. Different species and strains can respond differently to acid, oxygen, storage and formulation.
Can Bifidobacterium survive stomach acid?
Survival is formulation- and strain-dependent. Research has repeatedly looked at ways to reduce gastric exposure because loss of viable cells during transit can be substantial.
For example, experimental work with B. longum has investigated pH-responsive encapsulation and found that limiting release under simulated gastric conditions can help protect viable bacteria. A separate pilot study using acid-resistant microcapsules containing B. breve and B. longum also illustrates why researchers continue to study acid-resistant delivery systems for bifidobacteria.
Does that mean every Bifidobacterium needs an acid-resistant capsule?
No. A finished probiotic can already include its own protective technology, and some strains tolerate gastrointestinal conditions better than others. If the supplier provides data for the exact strain and formulation, that information is more useful than a general statement about the species.
But when you are filling an unencapsulated dry probiotic powder, the release characteristics of the empty capsule become one of the variables you can control.
DRcaps® for B. longum or B. breve powder
DRcaps® are HPMC hard capsules designed to delay release compared with conventional immediate-release capsules. They are suitable for compatible dry fills; they are not intended as a general capsule for water-based liquids.
A delayed-release shell can reduce early release of the fill in the stomach. It should not be presented as a guarantee that a particular B. longum or B. breve strain will survive, because viability depends on the complete formulation.
What about multi-strain probiotics?
Many products combine bifidobacteria with lactobacilli. In that situation, the formulation has to work for the blend rather than one organism in isolation. Recent simulated-gastrointestinal research comparing commercial formulations reported substantially greater viable-cell survival from a delayed-release capsule formulation than from the powder, liquid and standard-capsule formulations tested.
For more background, see Do probiotics survive stomach acid?
Choosing the right empty capsule
For dry probiotic powders, first decide whether you need conventional or delayed release. Then choose the physical size based on the powder volume. Our capsule size guide gives dimensions and approximate capacities across the standard range.
If delayed release is the goal, view our DRcaps® range.
References
Cook MT et al. Supercritical carbon dioxide interpolymer complexes improve survival of B. longum Bb-46 in simulated gastrointestinal fluids. PubMed PMID: 19062122.
Hirano R et al. Effect of a Bifidobacterium-Containing Acid-Resistant Microcapsule Formulation on Gut Microbiota: A Pilot Study. 2022. PubMed PMID: 36432516.
Van den Abbeele P et al. Survival of Probiotic Bacterial Cells in the Upper Gastrointestinal Tract… 2024. PubMed PMID: 39203927.
