The claim
Third-party tested (allergen badge on the product page)
What we found
Fine printThe page shows a badge only; the quality page lists batch targets and methods but names no outside lab and no certificate.
Clear price and 60-day refund; testing details thin and the pitch lacks human trials.
Health Corners editorial team · Fact-checked · Updated

Calculated from published specs and owner feedback
See all vitamins & multivitaminsPublished specs and owner feedback, not a hands-on test.
Published features and owner comments · not a lab test.
Published features and owner comments · not a lab test.
From published features and owner comments · not a lab test.
Average of the independent owner-review sources listed below.
The published claim, then what we found. Live statuses. How we review
The claim
What we found
Fine printThe page shows a badge only; the quality page lists batch targets and methods but names no outside lab and no certificate.
The claim
What we found
Fine printBacked by a 2024 lab paper in PLoS One with gut-simulated conditions; the authors are ZBiotics staff. Independent reviews (Sep and Oct 2026) found no published human trial of next-day outcomes for this product.
The claim
What we found
Fine printThe FAQ says compliance is not approval and the statements are not evaluated by the FDA. A third-party directory reports a self-affirmed GRAS route with no GRAS notice in the FDA inventory as of Sep 2026.
The claim
What we found
Fine printPolicy text: request by email within 60 days of the first shipment, refund less shipping and handling, and the company may refuse or restrict the guarantee.
The claim
What we found
Fine printFrom the founder's own tests as told to the SF Chronicle; not published or reviewed outside the company.
A coupon-code check on Fun Coupons, our partner coupon site. Not a product test.
Code tried by code-check on Nov 9, 2026: worked, 20% off.
Get it at Fun CouponsCode shown on our partner site Fun Coupons. We may earn a commission.
Fun Coupons checked this offer on Nov 9, 2026 (code checked by our checker). We show a saving only when its amount is stored and it was checked in the last 30 days. We never show the code here.
The code is shown on Fun Coupons, our partner site with this store’s verified offer. We may earn a commission.
Same verified offer as the card, from Fun Coupons. Sent by EmailerPros as “Fun Coupons via Health Corners.”
Max 3 deal emails a week. Confirm by email. Unsubscribe anytime.
Other products from ZBiotics. Not reviewed yet.

Sold by ZBiotics; we have not published a scored review of this product.
Not reviewed: listed so you can see the range.

Sold by ZBiotics; we have not published a scored review of this product.
Not reviewed: listed so you can see the range.
Brand scores out of 10 · See all vitamins & multivitamins
PromixSingle-ingredient whey with Eurofins testing named; refunds exclude subscriptions.
Seeq ProteinClear whey with full label text; all sales final unless damaged.
GrünsPopular gummy packs with posted label; subscription and refund terms need care.Where a score sits among everything scored in the same category:
Needs at least 2 scored in the category.
How we review →The average of independent owner-review sources (for example Reddit, Trustpilot and store reviews), weighted for volume and recency. A source with too few reviews is listed as “Not enough data” and left out.
How we review →Published features and terms (price, renewal, refunds, support and the category’s own criteria), each scored against written anchors. Calculated, not lab-tested.
How we review →