Synbiotics: Probiotic Plus Prebiotic, the Evidence
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Synbiotics: half-life, strengths and approval status

Status · Approval status · Half-life notes

What is synbiotics?

A synbiotic is a product that combines live probiotic bacteria with a prebiotic fiber (such as inulin or FOS) that feeds them.

Also known as: synbiotic, probiotic plus prebiotic, probiotic and fiber blend.

Amounts studied

Each trial used a different mix of bacteria and fiber, so we do not list one amount.

Approval status and how it is used

It is sold in the US as a dietary supplement. Under the 1994 dietary supplement law (DSHEA), FDA does not approve dietary supplements before they are marketed, and the maker, not FDA, is responsible for safety and labeling.

What studies show: a 2022 meta-analysis of adult chronic constipation found 4 synbiotic trials did not improve stool output or symptoms, while some probiotics alone (notably Bifidobacterium lactis) did, and concluded there is not enough evidence to recommend synbiotics for constipation (van der Schoot 2022). A 2018 meta-analysis for irritable bowel syndrome found data on synbiotics were sparse (Ford 2018).

Safety: adverse events were no more common with probiotics than placebo in the IBS analysis (Ford 2018). The sources here do not describe drug interactions.

Synbiotics half-life and time to peak

  • Half-lifeNot listed
  • Time to peak (Tmax)Not listed

Synbiotics act in the gut (live bacteria plus fiber they ferment) rather than being absorbed into the blood, so a half-life or time to peak does not apply.

How to track synbiotics in Dose Track

  1. Add synbiotics as a custom compound. Start typing its name and Dose Track fills in the details from its research library for you to check, and it sits next to everything else you take.
  2. Log each dose when you take it so your history shows exactly what you took and when.
  3. Set reminders on your own schedule, whether that is daily, weekly or every few days.
  4. Your log is stored on your phone and no account is needed. Data only leaves it for features you choose, like AI answers and lab reading.

How Dose Track handles peptides · Reconstitution calculator · Half-life calculator

Probioticsprobiotic, Lactobacillus Prebioticsprebiotic, prebiotic fiber Inulinchicory root fiber, inulin-type fructans Lactobacillus reuteriL. reuteri, Limosilactobacillus reuteri

Frequently asked questions

What is the half-life of synbiotics?+
Synbiotics act in the gut (live bacteria plus fiber they ferment) rather than being absorbed into the blood, so a half-life or time to peak does not apply.
Are synbiotics better than probiotics?+
Not shown. For chronic constipation, a 2022 meta-analysis found synbiotics did not help while some probiotics alone did; for IBS the synbiotic data were too sparse to judge.
Can I track synbiotics in Dose Track?+
Yes. Synbiotics is in Dose Track's research library, so when you add it as a custom compound its details are filled in for you to check. You can then log each dose next to your other compounds, set reminders on your own schedule, and see your history next to your lab results. Your log is stored on your phone and no account is needed. Data only leaves it for features you choose, like AI answers and lab reading.

Sources

  1. van der Schoot A, et al. Probiotics and synbiotics in chronic constipation in adults: a systematic review and meta-analysis of randomized controlled trials. Clin Nutr. 2022;41(12):2759-2777.
  2. Ford AC, et al. Systematic review with meta-analysis: the efficacy of prebiotics, probiotics, synbiotics and antibiotics in irritable bowel syndrome. Aliment Pharmacol Ther. 2018;48(10):1044-1060.
  3. FDA. Questions and answers on dietary supplements.

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