Stool habits settled sooner with the mix; overall symptom scores improved in both groups.
Martoni 2019, J Dig Dis · Source
Bifidobacterium longum
Strain UABl-14 (UAS Labs)
One of the first friendly bacteria to settle in the human gut, and a steady resident through adult life.
Firstone of the first bacteria to settle in a baby's gut
362women in an IBS trial of a related strain
10strains in the Daily Probiotic blend
Why we love it
B. longum is one of the first friendly bacteria to settle in a baby's gut, and it stays a natural, long-term resident of the healthy adult gut. We added it to round out the gut side of the blend, alongside the lactobacilli and B. lactis.
What does the research show?
Digestion
In 362 women with IBS, strain 35624 at 100 million CFU a day eased belly pain, bloating and other symptoms more than placebo. Our strain, in a mix, helped stool habits settle sooner in 94 adults with constipation.
Vaginal pH
In 36 women taking an oral 10-strain capsule that included our strain, UABl-14, vaginal pH dropped slightly over 4 weeks.
Studies
Human study tested in people Lab study a starting point, not proof
Studies that included our strain (UABl-14)
Vaginal pH dropped slightly (by 0.19 at 4 weeks). Nugent scores and lactobacilli levels did not change significantly.
Martoni 2022 · Source
Studies on other strains of this species
At 100 million CFU a day, more relief of pain, bloating and other symptoms than placebo; the other doses were no different from placebo.
Whorwell 2006, Am J Gastroenterol · Source
A cream with a B. longum extract reduced skin sensitivity and dryness compared with a placebo cream
Guéniche 2010, Exp Dermatol · Source
Which strain do we use?
Our strain is B. longum UABl-14 (UAS Labs), confirmed as a distinct strain by DNA testing (Shehata 2024). It has been studied in mixes, listed first above. The IBS findings come from another strain, and results belong to the strain tested.
Is B. longum safe to take?
No significant side effects were recorded in the large IBS trial. Rare bloodstream infections with a related strain have been reported in extremely premature babies given probiotics in hospital; all recovered, and no such reports in healthy adults were found. Ask a clinician first if you have a weakened immune system, a central line, a serious illness, or are pregnant or breastfeeding.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Last reviewed: November 2026.
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Reviewed by the Momotaro Apotheca medical team, including OB-GYNs and naturopathic doctors. Educational information, not medical advice. All ingredient research