Best Value
Culturelle
Digestive Daily Probiotic Capsules
8.0Good
One capsule of 10 billion CFU Lactobacillus rhamnosus GG plus 200 mg inulin, with potency guaranteed to expiration, for about 60 cents a day.
cGMP
2 videosGut Health & Probiotics
Synbiotic+
Two of the best-studied probiotic strains (LGG, BB-12) at 11B CFU guaranteed to expiration, plus a phage prebiotic and tributyrin. Top testing, premium price.
7.0
Mixed
Nutrition Reviews score
Weighted across efficacy, quality, value, experience & transparency. See breakdown
- Form
- Capsule
- Serving
- 1 capsule
- Servings
- 30
- Videos
- 3
Third-party testedNon-GMO Project VerifiedClean Label Project
VeganVegetarianGluten-freeNon-GMO
Check price on AmazonBuy from the brand
We may earn a commission when you buy through these links — it never affects our scores. How we make money
Last reviewed September 29, 2026 by the Nutrition Reviews Editorial Team · How we review
Our verdict
Synbiotic+ pairs two of the best-researched probiotic strains with a potency guarantee through expiration and top-tier testing transparency. The extras you pay for, the phage prebiotic and tributyrin, have limited human evidence, and the finished formula hasn't been tested in people. It's a solid premium pick if you value traceability; budget shoppers can get LGG alone for a fraction of the price.
Best for
- Shoppers who prioritize testing and traceability
- People who want clinically studied strains (LGG, BB-12)
- Vegan and allergen-conscious users
Skip it if
- Budget shoppers
- People who dislike mint flavors
- Anyone who wants a formula tested as a whole in human trials
How it scored
Our five-factor score out of 10. Factors are weighted by how much they matter to the outcome you’re paying for. Methodology
7.0
Mixedout of 10
- Efficacy30%7.0
Key ingredients at clinically studied doses, and how strong the evidence is.
- Quality & Purity25%8.3
Third-party testing and certifications, manufacturing standards, contaminant testing, recall history.
- Value20%5.5
Cost per effective serving compared with category peers.
- Experience15%7.2
Taste, mixability, texture and tolerability from aggregated buyer and creator feedback.
- Transparency10%6.0
Full label disclosure (no proprietary blends), available COAs, honest marketing.
Our review
Ritual Synbiotic+ puts three components into one mint-scented, delayed-release capsule. It combines 11 billion CFU of two branded probiotic strains, LGG (Lactobacillus rhamnosus GG) and BB-12 (Bifidobacterium animalis ssp. lactis), with 15 mg of PreforPro, a prebiotic made of bacteriophages, and 300 mg of tributyrin (CoreBiome), a postbiotic that delivers butyrate. Importantly, Ritual guarantees the 11 billion CFU at the expiration date, not just at manufacture.
The strain choice is the product's strength. LGG and BB-12 are two of the most studied probiotics in the world. A placebo-controlled trial of 1,248 adults, funded by BB-12's maker, found BB-12 increased bowel-movement frequency in people with infrequent stools, though it didn't improve overall relief of abdominal discomfort. The prebiotic and postbiotic have much smaller evidence bases, and Ritual's own research on the finished product is a lab gut-model study, not a human trial. The label also lists LGG and BB-12 as a combined 40 mg blend, so you can't see the split between them.
Quality and transparency are otherwise excellent. Ritual has every lot third-party tested for heavy metals and microbes, tests for major allergens and names the supplier and country for each ingredient. The product is Non-GMO Project Verified and holds a Clean Label Project Purity Award. The capsule is vegan and free of major allergens.
It's pricey at $54 a month on subscription or $59.99, roughly $1.80–2.00 a day. buyers like the one-a-day format, but effectiveness reviews are mixed, the mint scent divides people, and some report nausea, heartburn or stomach pain.
What’s inside
| Key ingredient | Per serving | Why it matters |
|---|---|---|
| Probiotic Blend: Lactobacillus rhamnosus (LGG®) and Bifidobacterium animalis ssp. lactis (BB-12®) Two extensively studied strains. BB-12 increased bowel-movement frequency in a 1,248-person placebo-controlled trial. | 40 mg (11 billion CFU at expiration) | Two extensively studied strains. BB-12 increased bowel-movement frequency in a 1,248-person placebo-controlled trial. |
| PreforPro® (bacteriophage blend) A phage-based prebiotic meant to target undesirable bacteria. Human data are limited. | 15 mg | A phage-based prebiotic meant to target undesirable bacteria. Human data are limited. |
| Tributyrin (as CoreBiome®) A butyrate-releasing postbiotic intended to support the gut lining. Human evidence is early-stage. | 300 mg | A butyrate-releasing postbiotic intended to support the gut lining. Human evidence is early-stage. |
Supplement Facts
Serving Size One (1) vegan capsule
Servings Per Container 30
Amount Per Serving% Daily Value
Calories 5
Probiotic Blend: Lactobacillus rhamnosus (LGG®), Bifidobacterium animalis ssp. lactis (BB-12®) 40mg / 11B CFUs†**
PreforPro® (LH01 - Myoviridae, LL5 - Siphoviridae, T4D - Myoviridae, LL12 - Myoviridae) 15mg**
Tributyrin (as CoreBiome®) 300mg**
* Percent Daily Values are based on a 2,000 calorie diet. † Daily Value not established.
Other ingredients: Stomach acid-resistant outer vegan capsule (hypromellose, gellan gum), medium chain triglycerides (from coconut) inner vegan capsule (hypromellose), silica, cellulose.
Flavors & variants
Mint
Testing & quality
Ritual states every lot is third-party tested for heavy metals, microbes and major allergens; Essential for Women 18+ is USP Verified and Non-GMO Project Verified.
Goals it supports
Creator video reviews
Independent creators reviewing Synbiotic+ on TikTok and YouTube.
1 positive2 mixed0 critical
Pros & cons
What we like
- LGG and BB-12 are among the most studied probiotic strains
- 11 billion CFU guaranteed at the expiration date
- Every lot is third-party tested, suppliers are disclosed, and it's Non-GMO Project Verified with a Clean Label Project Purity Award
- One delayed-release vegan capsule a day
Watch-outs
- About $1.80–2.00 a day
- The PreforPro prebiotic and tributyrin postbiotic have limited human evidence
- The split between the two strains in the 40 mg probiotic blend isn't disclosed
- Some buyers report nausea or heartburn, or dislike the mint scent
Questions buyers ask
Is the 11 billion CFU count guaranteed until expiration?
Yes. A note on the Supplement Facts panel says the 11 billion CFU applies at the expiration date under recommended storage conditions, not just at manufacture. That's a stronger promise than many probiotics make. The capsules are shelf-stable, so refrigeration isn't needed; just keep the bottle cool, dry and tightly closed.
What are PreforPro and tributyrin?
PreforPro is a blend of four bacteriophages, viruses that infect specific bacteria, marketed as a prebiotic that helps crowd out undesirable gut bacteria. Tributyrin (as CoreBiome) releases butyrate, a short-chain fatty acid that fuels the cells lining the colon. Both are plausible, but their human research is far thinner than for LGG and BB-12.
How does Ritual Synbiotic+ compare with Seed DS-01?
Seed DS-01 uses 24 strains plus a pomegranate prebiotic and has a large placebo-controlled trial of the finished product for bloating and gas. Ritual uses two well-studied strains plus a phage prebiotic and tributyrin, with more detailed testing and supplier disclosure but no human trial of the full formula. Both cost roughly $50–60 a month.
Alternatives worth a look
Similar products, ranked by our score.
Physician's Choice
60 Billion Probiotic
7.2Mixed
Amazon's mega-seller: 60 billion CFU from 10 species plus prebiotic fiber, third-party tested and cheap. But it names no strains, so it can't be matched to research.
Non-GMO3rd-party tested+1
2 videosGut Health & Probiotics
Best Overall
8.3Good
Classic psyllium fiber with some of the strongest evidence in the aisle for regularity and LDL cholesterol, at about 19 cents a teaspoon. Contains aspartame and dye.
3 videosGut Health & Probiotics
Trending
7.4Mixed
A 24-strain probiotic plus pomegranate prebiotic backed by its own 350-person trial on bloating and gas. Strong science, premium price.
3rd-party tested
4 videos$1.67/serving
Read the research
Buying Guides 9 min read
Are Greens Powders Worth It? What the Research Actually Says
What's in greens powders, what the limited research shows, why blends and contaminant testing matter, how the cost compares with frozen vegetables, and who might benefit.
Nutrition Reviews Editorial Team · Sep 28, 2026
Guides 10 min read
Probiotics Explained: Strains, CFUs, and What the Evidence Actually Supports
Probiotic benefits depend on the exact strain and dose. How to read strain names and CFU claims, where the evidence is solid or mixed, and who should skip them.
Nutrition Reviews Editorial Team · Sep 28, 2026
Safety 9 min read
Are TikTok Shop Supplements Legit? How to Vet Viral Products Before You Buy
How creator commissions work, what TikTok and the FTC require, where counterfeit and contamination risks hide, and a 10-minute checklist before you tap 'buy'.
Nutrition Reviews Editorial Team · Sep 28, 2026