Grade: C

MEDIUM RISK

Chapter One by Zahler

Item: Chapter One by Zahler
Rating: 50
Author: SupplementChecker

Chapter One by Zahler has a SupplementChecker.co trust score of 50/100, which translates to a grade of C and a MEDIUM risk level. Notably, there are no third-party testing certifications on record for Chapter One by Zahler. This means consumers have no independent verification of label claims or ingredient purity, but the brand does have a clean FDA record.

Chapter One by Zahler Trust Summary

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

Chapter One by Zahler 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 Chapter One by Zahler

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 Chapter One by Zahler Third-Party Tested?

No — Chapter One by Zahler 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 Chapter One by Zahler a Good Brand?

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

About Chapter One by Zahler

Chapter One by Zahler is a supplement brand operating independently in the US. The founding date of the company is unknown. They offer a range of supplements, but their market position and specific target audience are not clearly defined.

Product Specialization

Chapter One by Zahler specializes in supplements within the fish oil and minerals categories. While specific product types are not detailed, consumers can expect to find a variety of supplements catering to these areas.

Testing & Certifications Explained

Chapter One by Zahler does not have any third-party testing certifications on record. This means that independent organizations have not verified the quality, purity, or potency of their supplements. Consumers must rely solely on the brand's claims without independent confirmation, which increases the risk of inaccurate labeling or contamination. Many consumers prefer third-party tested supplements to ensure product safety and efficacy.

How Chapter One by Zahler Compares

Compared to competitors like Nordic Naturals (trust score 85/100) and NOW Foods (trust score 78/100), which both have third-party certifications, Chapter One by Zahler lags behind in trust and transparency. Garden of Life (trust score 65/100) also has certifications that Chapter One by Zahler lacks. These competitors demonstrate a greater commitment to independent verification of their products.

Buying Guidance

Given Chapter One by Zahler's trust score and lack of third-party testing, consumers should exercise caution when considering their products. Purchase from reputable retailers and carefully examine product labels. Look for any available information about ingredient sourcing or manufacturing processes to make an informed decision.

Frequently Asked Questions

Has Chapter One by Zahler had any recalls?

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

Are Chapter One by Zahler supplements third-party tested?

No — Chapter One by Zahler 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 Chapter One by Zahler safe?

Chapter One by Zahler 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 Chapter One by Zahler a good brand?

Chapter One by Zahler 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 Chapter One by Zahler'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/chapter-one-by-zahler/" width="220" height="110" frameborder="0" loading="lazy" title="Chapter One by Zahler trust score by SupplementChecker"></iframe>

Medium · 320×160

<iframe src="https://supplementchecker.co/embed/chapter-one-by-zahler/" width="320" height="160" frameborder="0" loading="lazy" title="Chapter One by Zahler trust score by SupplementChecker"></iframe>

Large · 420×210

<iframe src="https://supplementchecker.co/embed/chapter-one-by-zahler/" width="420" height="210" frameborder="0" loading="lazy" title="Chapter One by Zahler trust score by SupplementChecker"></iframe>

Paste the snippet anywhere on your site. The badge updates automatically when Chapter One by Zahler'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 Chapter One by Zahler and 500+ other brands to find the ones that actually prove what's on the label.

See the best third-party tested supplements →