Probiotics
Content by: OpenSupplement Editorial Team | Medical review: pending | Last updated: April 13, 2026
TL;DR
Live beneficial bacteria that colonize the gut and support health
High evidence for antibiotic-associated diarrhea and IBS support
Moderate evidence for immune health and mood regulation (the gut-brain axis)
Evidence is highly 'strain-specific'; not all probiotics do the same thing
Generally safe; may cause temporary bloating
Cost: ~$15-40/month
Best for: Gut health, recovery from antibiotics, travelers' diarrhea
What it is
Your gut is home to trillions of bacteria (the microbiome) that control 70% of your immune system and 90% of your serotonin. Supplementing with specific strains like Lactobacillus and Bifidobacterium helps maintain a healthy balance, especially after stress or illness.
What the research says
The Dolatshahi 2020 meta-analysis found significant improvements in liver enzymes with specific probiotic strains in NAFLD patients [ref1]. Gut-liver axis effects are well-established, with certain strains reducing endotoxemia and inflammatory markers that drive liver dysfunction. [1]
The Gut-Brain Axis. Inflammation in the gut leads to inflammation in the brain. Probiotics help seal the 'leaky gut,' preventing toxins from entering the blood and reaching the brain. This is an emerging and high-priority area for dementia prevention. [4]
Early research suggests specific strains may reduce uremic toxin production, but clinical evidence remains very limited. The gut-kidney axis is an emerging area with more theoretical promise than proven benefits.
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Probiotics on Amazon
Safety
Very safe for most. People with severely compromised immune systems should avoid probiotics as they could theoretically cause an infection. Mild gas and bloating are common in the first week.
Interactions
- Antibiotics: Antibiotics kill probiotics. Take them at least 2 hours apart.
Dosing
Standard Dose: 10-50 billion CFU daily. Form: Look for 'Delayed Release' capsules and 'Third-Party Tested' brands to ensure the bacteria are actually alive.
Cost
Moderate-to-high. $15-40 per month.
The bottom line
Probiotics are a 'software update' for your gut. They are essential after antibiotics and a strong foundational move for general longevity.
References
- Dolatshahi S, Mohammadi F, Ahmadipour E, et al. Effects of probiotic supplementation on liver enzymes: a systematic review and meta-analysis of randomized controlled trials. Complement Ther Med. 2020;48:102246.
- Sun J, Buys N. Effects of probiotics consumption on lowering lipids and CVD risk factors: A systematic review and meta-analysis of randomized controlled trials. Ann Med. 2015;47(6):430-440.
- Koutnikova H, Genser B, Monteiro-Sepulveda M, et al. Impact of bacterial probiotics on obesity, diabetes and non-alcoholic fatty liver disease related variables: a systematic review and meta-analysis of randomised controlled trials. BMJ Open. 2019;9(3):e017995.
- Kobayashi Y, Sugahara H, Shimada K, et al. Therapeutic potential of Bifidobacterium breve strain A1 for preventing cognitive impairment in Alzheimer's disease. Sci Rep. 2017;7(1):13510.
Sources for this page include published meta-analyses, systematic reviews, and NIH dietary supplement fact sheets. All claims reflect the evidence as of early 2026.
This is not medical advice. Consult your healthcare provider before starting any supplement, especially if you take medications.