Guide

Does MAV Nutrition Prebiotics and Probiotics work? Sixteen species, no strains, and two formulas under one name

MAV Nutrition Prebiotics and Probiotics is a two-capsule-a-day product sold mainly on Amazon, with a label that prints 16 bacterial species, a 50 billion CFU total and a 1,000 mg prebiotic blend of xylooligosaccharide (XOS) and chicory inulin. It is one of the more heavily rated probiotics on Amazon, and the same brand sells a different formula under a similar name elsewhere. This page sets out what the label prints and leaves out, which formula the ratings may describe, what the trials of the ingredient classes found at what doses, what the two review pools are, and what each route to buying it costs.

What MAV Nutrition Prebiotics and Probiotics is, and what it is not

The Supplement Facts panel on the 50 billion CFU version, per serving of two delayed-release vegetarian capsules, lists a prebiotic fiber blend of 1,000 mg (xylooligosaccharide and inulin from chicory root, with no split between them) and a probiotic blend of 280 mg providing 50 billion CFU. A 60-capsule bottle is 30 servings. The other ingredients are hypromellose, which is the capsule, and NuFlow rice hulls, a flow agent. No sweeteners or flavors are listed.

The probiotic blend names sixteen organisms: Bifidobacterium lactis, Lactobacillus reuteri, L. plantarum, L. rhamnosus, B. longum, B. breve, B. bifidum, L. acidophilus, L. gasseri, L. paracasei, B. infantis, L. helveticus, L. casei, L. salivarius, L. fermentum and Bacillus subtilis. Fifteen are the usual Lactobacillus and Bifidobacterium species and one is a spore-forming Bacillus. None carries a strain designation, and no per-organism count is printed. Dividing the blend weight by the total gives about 5.6 mg of material per billion CFU, which is all the arithmetic the panel allows. The 50 billion figure is stated “at the time of manufacturing”, so it is a count at manufacture and not at expiry.

It is not a product with a trial behind it, and it is not a single-strain capsule whose strain can be looked up. It is a multi-species blend sold as a synbiotic, meaning live bacteria plus a prebiotic fiber for them to ferment. The label also carries icons for “Doctor Formulated”, “3rd-Party Tested”, GMP, gluten free and vegan; the pages we read name no physician and no testing laboratory.

Two formulas under one name

The listing text and the label image do not describe the same capsule. The Amazon listing’s ingredient and directions fields read as a 20 billion CFU, two-organism product (L. acidophilus and B. bifidum, 100 mg) with 400 mg of XOS per capsule, taken one capsule a day. The Amazon gallery image of the panel and the brand’s own page describe the 50 billion CFU, 16-organism product with 1,000 mg of prebiotics, taken as two capsules. Target and Vitacost list MAV’s 60-capsule prebiotic and probiotic with the 20 billion panel, and a third-party rating site’s page for the brand does the same.

The trial of the product itself

There is none. We searched PubMed under the brand name and the product name and ClinicalTrials.gov under “MAV Nutrition”, and the NIH Dietary Supplement Label Database holds 11 MAV labels but none for this product. The brand cites no study; its copy says “16 evidence-based” strains without naming them. The evidence below belongs to the ingredient classes, and in each case the label does not let a reader match its dose or organism to the trial.

The evidence for combination probiotics

The closest trial in kind is a placebo-controlled study of 49 adults with IBS (25 on the probiotic, 24 on placebo) who took a twice-daily mixture of B. longum, B. bifidum, B. lactis, L. acidophilus, L. rhamnosus and Streptococcus thermophilus for four weeks. Substantial relief was reported by 68.0% against 37.5% on placebo, and pain, discomfort and bloating improved in the probiotic group and not the placebo group (Yoon et al., Journal of Gastroenterology and Hepatology, 2014). Five of those species are also on this label, but the trial used named strains, and this label names none. A second multispecies trial in 81 IBS patients over four weeks found adequate relief in 74.4% against 61.9% on placebo, a difference that was not statistically significant (p = 0.230), with no difference in total symptom score (PMID 26388670).

The wider picture is less favorable to any one blend. A meta-analysis pooled 82 randomized trials in 10,332 patients with IBS, found only 24 at low risk of bias, and rated the certainty of benefit for abdominal bloating or distension as very low for combination probiotics and for Bacillus strains, which are the two groups this label falls into. Adverse events were not higher than on placebo (Goodoory et al., Gastroenterology, 2023). An earlier review of 53 probiotic trials in 5,545 patients said particular combinations or specific species and strains appeared to help, without a definitive answer on which (Ford et al., Alimentary Pharmacology & Therapeutics, 2018). Results belong to strains and doses, and a species list with no strain codes gives no way to say which of them applies. For how to read a CFU figure, see how many CFU you need.

The evidence for the prebiotic blend

XOS and inulin each have human trials, at doses well above the label’s. In 32 healthy adults, 1.4 g or 2.8 g of XOS a day for eight weeks raised bifidobacteria in both groups, more at 2.8 g, with no significant gut side effects (Finegold et al., Food & Function, 2014). At 8 g a day for 21 days in healthy adults, bowel movements per day rose, while bloating, abdominal pain and flatulence did not change (Childs et al., British Journal of Nutrition, 2014). For chicory inulin, 12 g a day for four weeks in 44 adults with constipation raised median stool frequency from 3.0 to 4.0 a week against placebo (Micka et al., International Journal of Food Sciences and Nutrition, 2017).

Against those, the label’s entire prebiotic blend is 1,000 mg, so XOS plus inulin together come to at most 1 g a day, below the lowest XOS dose tested and about one-eighth of the 8 g and one-twelfth of the 12 g. Because the split is not printed, the amount of either fiber is not known. One synbiotic of a similar design, with Lactobacillus and Bifidobacterium species, XOS and fiber, improved bowel perception in 30 Korean adults with functional constipation over four weeks, though that was a different formula and the authors were from its maker (Kim et al., Journal of Medicinal Food, 2021).

How to take it

The brand’s page and the label image say to take two capsules daily, preferably with a meal. Amazon’s directions field says one capsule, which belongs to the 20 billion formula. The capsule is delayed-release, a design that is meant to carry the bacteria past stomach acid; we found no survival or release testing published for this product. The trials above ran three to eight weeks, so a month at the label serving is a reasonable first test.

Side effects and who should not take it

The safety text on the Amazon listing advises consulting a healthcare provider before use, especially if pregnant, nursing, intending to become pregnant, taking medication or having a medical condition, and says to take only as directed, keep out of reach of children and not use the product if the seal is broken. The image we read shows only the panel, so we could not confirm the same text is printed on the 50 billion bottle. Target’s text for the 20 billion product adds “adult use only”. Inulin and XOS are fermented in the colon and can produce gas in some people, and 1,000 mg is a small amount of either. Amazon’s review summary says customers report no side effects or discomfort, and lists “side effects” as a topic in 278 reviews without showing which way they lean.

The panel prints no allergen statement beyond gluten-free and vegan icons, and the NuFlow rice-hull flow agent is the only non-capsule excipient. For the general picture on gas and bloating when starting a probiotic, see probiotic side effects.

What the reviews say

There are two pools, and neither is straightforward. Amazon shows 4.6 from 6,998 ratings: 77% five-star, 13% four, 6% three, 1% two and 3% one. Amazon’s own summary of the review text, generated by Amazon, says customers find it effective, mention digestion and particularly bloating, and call the capsules easy to take and flavorless. The review text itself is behind a sign-in and we did not read it. Because the listing carries text for two formulas, that count may span both capsules.

The brand’s own site shows 4.8 from 840 reviews in the page markup, and its review feed holds 1,001 reviews with a 4.77 average. All 1,001 are flagged as incentivized by the review platform, and they are dated from 2018 to 2022, before the 50 billion product page existed. About 121 are for other MAV products such as weight-loss pills, krill oil and collagen, and several say the reviewer got the bottle free through a rebate or coupon. Praise there is less bloating, regularity and easy swallowing; the small set of low scores mentions no change, capsules that are hard to swallow, and a free-bottle coupon that did not work. Target shows 4.91 from 64 ratings and Vitacost 4.56 from 48, both for the 20 billion formula. We found no Trustpilot reviews and no Better Business Bureau profile, which is an absence of data and not evidence either way.

Price, refunds and subscription terms

On Amazon the 60-capsule bottle is $21.99, which is $0.73 a day at the two-capsule serving; Subscribe & Save is $19.79, or $0.66 a day. Amazon’s listed “$0.37 per count” is per capsule, not per day. The 30-capsule size is $14.95, or $1.00 a day. The brand’s own page lists $26.39 for 60 capsules, $0.88 a day, with free shipping over $40, and showed it sold out when we read it; it has no subscription option. Subscribe & Save through Amazon is the only subscription we found, and we did not read its terms beyond the price.

The brand’s refund policy allows returns within 30 days for a refund or exchange, with shipping and handling not refunded and outbound shipping possibly deducted from free-shipping orders. The Amazon listing is marked non-returnable for food-safety reasons. We found no money-back guarantee wording on the brand site. In the brand-site reviews, three mention subscribing or canceling and none reports a billing problem.

Who makes it

The label says “Manufactured for MAV Nutrition, LLC” with an address on 2nd Avenue South in St. Petersburg, Florida. The brand’s About page says “100% third-party tested” and “USA GMP-certified facilities” as claims, and it names no founder, physician or formulator. The plant is not named, and we found no testing laboratory and no certificate of analysis; the brand’s testing pages we tried returned not found. MAV sells across many categories, including fish oil, gummies, children’s products and weight management.

Who this product suits

• Someone who wants a multi-species probiotic with a prebiotic included and is content to judge it by how they feel over a month, since the label gives no strain to look up.
• Someone buying on Amazon who will check the panel on the bottle that arrives, given the two formulas.
• Someone comparing cost per day across probiotics: $0.73 a day here against $0.75 for Culturelle Digestive Daily, which prints a single named strain at 10 billion CFU, and $2.00 for Seed DS-01, which prints 24 named strains and has a trial of the finished formula.

Another species-only capsule with the same kind of label is covered in the Biome V3 guide. For choosing between product types, see which probiotic to take, or start from symptoms with the quiz.

The products in this catalog

Common questions

Sources

• Yoon JS, Sohn W, Lee OY, et al. Effect of multispecies probiotics on irritable bowel syndrome: a randomized, double-blind, placebo-controlled trial (49 patients). Journal of Gastroenterology and Hepatology, 2014. PMID 23829297
• Randomized trial of a multispecies probiotic in 81 patients with irritable bowel syndrome. PMID 26388670
• Goodoory VC, Khasawneh M, Black CJ, Quigley EMM, Moayyedi P, Ford AC. Efficacy of probiotics in irritable bowel syndrome: systematic review and meta-analysis (82 randomized trials, 10,332 patients). Gastroenterology, 2023. PMID 37541528
• Ford AC, Harris LA, Lacy BE, Quigley EMM, Moayyedi P. Systematic review with meta-analysis: the efficacy of prebiotics, probiotics, synbiotics and antibiotics in irritable bowel syndrome. Alimentary Pharmacology & Therapeutics, 2018. PMID 30294792
• Finegold SM, Li Z, Summanen PH, et al. Xylooligosaccharide increases bifidobacteria but not lactobacilli in human gut microbiota (1.4 g and 2.8 g a day). Food & Function, 2014. PMID 24513849
• Childs CE, Röytiö H, Alhoniemi E, et al. Xylo-oligosaccharides alone or in synbiotic combination with Bifidobacterium animalis subsp. lactis induce bifidogenesis and modulate markers of immune function in healthy adults (8 g a day). British Journal of Nutrition, 2014. PMID 24661576
• Micka A, Siepelmeyer A, Holz A, Theis S, Schön C. Effect of consumption of chicory inulin on bowel function in healthy subjects with constipation (12 g a day). International Journal of Food Sciences and Nutrition, 2017. PMID 27492975
• Kim MC, et al. XOS plus probiotics (ID-HWS1000) in adults with functional constipation. Journal of Medicinal Food, 2021. PMID 34406877
• MAV Nutrition on Amazon: Supplement Facts image, listing text, safety text, ratings and price. amazon.com/dp/B07HJD4QQJ
• MAV Nutrition brand pages: product page, refund policy and About page. mavnutrition.com; the 20 billion formula at Target and Vitacost