Grade: C

MEDIUM RISK

Bayer One A Day Adult

Item: Bayer One A Day Adult
Rating: 50
Author: SupplementChecker

Bayer One A Day Adult has a SupplementChecker trust score of 50/100, which is a Grade C and indicates MEDIUM risk. Notably, there are no third-party testing certifications on record for Bayer One A Day Adult. Consumers should be aware of this when considering whether Bayer One A Day Adult is a good brand for their needs.

Bayer One A Day Adult Trust Summary

Trust Score: 50/100 (Fair)
Grade: C
Risk Level: MEDIUM
Third-Party Tested: No
FDA Recalls: 0
Adverse Events: 0

Bayer One A Day Adult has a trust score of 50/100 (Fair). The brand is not third-party tested by NSF, USP, or Informed Sport, has no FDA recalls on record and no adverse event reports.

Where to Buy Bayer One A Day Adult

Purchase from trusted retailers. We may earn a commission at no extra cost to you.

Buy on iHerb Buy on Amazon

Check another brand:

e.g. Nature Made, Thorne, NOW Foods...

Check

Red Flags

⚠No third-party testing certifications found
⚠No GMP certification visible

Verified Strengths

✓Clean FDA record — no warnings, recalls, or significant adverse events

Certifications

No certifications on record. This brand has not demonstrated GMP compliance or third-party testing verification.

FDA Record

FDA Warning Letters

Recalls

Adverse Reports

Clean record — no FDA warnings, recalls, or significant adverse events.

Is Bayer One A Day Adult Third-Party Tested?

No — Bayer One A Day Adult is not currently third-party tested by independent certifiers like NSF, USP, or Informed Sport. No GMP certification was found on record either. We recommend looking for brands with verified third-party testing for the highest confidence in product quality. See our guide to third-party tested supplements.

Is Bayer One A Day Adult a Good Brand?

Bayer One A Day Adult scores 50/100 (C) — this is a below-average score. We recommend considering brands with third-party certifications like NSF or USP. Bayer One A Day Adult has a clean FDA record with no warnings or recalls. The brand does not currently hold third-party testing certifications.

About Bayer One A Day Adult

Bayer One A Day Adult is a US-based supplement brand focused on providing daily multivitamins. The founding date of Bayer One A Day Adult is unknown. The brand operates independently.

Product Specialization

Bayer One A Day Adult specializes in the specialty supplement category, primarily offering a range of multivitamins tailored for adults.

Testing & Certifications Explained

Bayer One A Day Adult does not appear to have any third-party testing certifications. This means that independent organizations are not verifying the quality, purity, or potency of their products. Consumers should be aware that the absence of these certifications means there is less independent assurance about what the product contains.

How Bayer One A Day Adult Compares

Compared to competitors like Nature Made (trust score 75/100) and NOW Foods (trust score 82/100), Bayer One A Day Adult's trust score is lower. Both Nature Made and NOW Foods have products that are third-party tested supplements. This difference highlights the importance of considering certification status when choosing a supplement brand.

Buying Guidance

Given the lack of third-party testing, consumers should carefully evaluate whether Bayer One A Day Adult is safe for their individual needs. Purchase from reputable retailers and check for any available Bayer One A Day Adult reviews from other consumers before buying.

Frequently Asked Questions

Has Bayer One A Day Adult had any recalls?

No — as of 2026, Bayer One A Day Adult has zero FDA product recalls on record. They maintain a clean FDA record with no warning letters or significant adverse event reports. Bayer One A Day Adult received a trust score of 50/100 from SupplementChecker.

Are Bayer One A Day Adult supplements third-party tested?

No — Bayer One A Day Adult supplements are not currently third-party tested by independent certifiers like NSF, USP, or Informed Sport. No independent testing or GMP certification was found on record.

Is Bayer One A Day Adult safe?

Bayer One A Day Adult received a trust score of 50/100 (grade: C, risk level: MEDIUM). This score is calculated from FDA records, third-party certifications, adverse event reports, and transparency practices. No FDA warnings or recalls are on record.

Is Bayer One A Day Adult a good brand?

Bayer One A Day Adult scores 50/100 (grade: C) — this is below average. We recommend looking for brands with third-party certifications like NSF or USP. They do not currently hold third-party testing certifications like NSF, USP, or Informed Sport. No FDA warnings or recalls found.

Get FDA Recall Alerts

We'll notify you when FDA recalls affect supplement brands you care about.

Compare Similar Brands

Brands in similar categories with comparable trust profiles. Compare certifications, scores, and safety records.

65/100

Lower rated

Brightside

Grade B • Higher score

65/100

Lower rated

Outwork Nutrition

Grade B • Higher score

65/100

Lower rated

Vital Vitamins

Grade B • Higher score

65/100

Lower rated

Thesis

Grade B • Higher score

65/100

Lower rated

Traditional Medicinals

Grade B • Higher score

Want more comparisons? Browse our supplement categories or check our buying guides.

How We Calculated This Score

Every brand starts with a baseline score of 70/100.

Points added for: Third-party certifications (NSF +15, USP +15, Informed Sport +10), publishing lab results (+10), clean regulatory record (+10), 10+ years in business (+10), organic certification (+5).

Points deducted for: FDA warning letters (-25), product recalls (-20), high adverse events (-15), no third-party testing (-15), proprietary blends (-10), no GMP (-10).

Score is capped at 0-100. Grade and risk level are derived from the final score.

All data sourced from FDA.gov, Health Canada (LNHPD / recalls-rappels), NSF.org, USP.org, and publicly available brand information. Last updated: 4/9/2026.

Promote Your Trust Score

Embed this badge on your site — it displays Bayer One A Day Adult's verified trust score and links back to this profile page. Helps show buyers you're transparent about third-party testing.

Small · 220×110

<iframe src="https://supplementchecker.co/embed/bayer-one-a-day-adult/" width="220" height="110" frameborder="0" loading="lazy" title="Bayer One A Day Adult trust score by SupplementChecker"></iframe>

Medium · 320×160

<iframe src="https://supplementchecker.co/embed/bayer-one-a-day-adult/" width="320" height="160" frameborder="0" loading="lazy" title="Bayer One A Day Adult trust score by SupplementChecker"></iframe>

Large · 420×210

<iframe src="https://supplementchecker.co/embed/bayer-one-a-day-adult/" width="420" height="210" frameborder="0" loading="lazy" title="Bayer One A Day Adult trust score by SupplementChecker"></iframe>

Paste the snippet anywhere on your site. The badge updates automatically when Bayer One A Day Adult's trust score changes.

Own this brand? Contact us to update your information.

Want to find supplements you can trust?

Third-party testing is the single best indicator of supplement quality. We analyzed Bayer One A Day Adult and 500+ other brands to find the ones that actually prove what's on the label.

See the best third-party tested supplements →