Resolve the name before comparing brands
NIH’s probiotic nomenclature table lists Bifidobacterium longum subspecies longum, strain 35624. Align’s naming explanation says this strain was formerly called Bifidobacterium infantis or Bifantis. A change in scientific naming does not by itself mean a different strain was substituted. [1][2]
The species name alone is insufficient
A different product labeled B. infantis is not automatically equivalent to 35624. Likewise, a bottle saying only B. longum does not identify this strain. Start with the specific evidence or clinical purpose you are trying to match, then compare the complete strain designation and actual product. [1]
Check formulation details after identity
Imagine an older recommendation mentions infantis 35624 while the current package says longum 35624. The matching code helps resolve the naming issue; it does not settle dose, suitability or allergens. The inspected Align FAQ identifies milk components in its discussed capsule formula, so a milk allergy requires an additional product-specific check. [2][3]
| Check | Interpretation |
|---|---|
| Older infantis 35624 reference | Check updated taxonomy |
| Current longum 35624 label | Same strain code despite naming change |
| Another infantis strain | Do not assume interchangeable evidence |
Sources for this article
- Probiotics - Health Professional Fact Sheet
Source consulted: 2026-09-20. This is a reference resource, not a claim that we conducted the studies or tested a product. - Align: Bifidobacterium longum 35624 naming
Source consulted: 2026-09-20. This is a reference resource, not a claim that we conducted the studies or tested a product. - FAQs on Usage, Safety & Storage | Align Probiotic
Source consulted: 2026-09-20. This is a reference resource, not a claim that we conducted the studies or tested a product.