Four Sail
Four Sail has a SupplementChecker trust score of 75/100, which is a Grade B+ and indicates a LOW risk level. Four Sail claims to conduct third-party testing, but does not publish lab results. While the brand has a clean FDA record, the lack of visible GMP certification is a red flag for manufacturing quality control.
Four Sail Trust Summary
- Trust Score
- 75/100 (Good)
- Grade
- B+
- Risk Level
- LOW
- Third-Party Tested
- Yes (self-reported)
- FDA Recalls
- 0
- Adverse Events
- 0
Four Sail has a trust score of 75/100 (Good). The brand is claims third-party testing (self-reported), has no FDA recalls on record and no adverse event reports.
Where to Buy Four Sail
Purchase from trusted retailers. We may earn a commission at no extra cost to you.
Red Flags
- ⚠No GMP certification visible
Verified Strengths
- ✓Claims third-party testing
- ✓Clean FDA record — no warnings, recalls, or significant adverse events
Certifications
Third-party testing means an independent laboratory has verified this product's contents, purity, and potency match what's on the label.
FDA Record
Clean record — no FDA warnings, recalls, or significant adverse events.
Is Four Sail Third-Party Tested?
Yes — Four Sail is Third-party tested. This means an independent laboratory has verified that the products' contents, purity, and potency match their label claims.
Is Four Sail a Good Brand?
Four Sail scores 75/100 (B+) — this is an average score. There may be room for improvement in testing transparency or certifications. Four Sail has a clean FDA record with no warnings or recalls. The brand holds third-party certifications (Third-party tested), which is a strong quality indicator.
About Four Sail
Four Sail is an independent supplement brand based in the US. The company's founding date is unknown. Four Sail offers a range of supplements.
Product Specialization
Four Sail focuses on herbal and vitamin supplements. They offer products across these categories.
Testing & Certifications Explained
Four Sail claims that their products undergo third-party testing, but they do not provide specific certifications or publish lab results. This means that while the brand asserts independent verification of their products' contents and purity, consumers cannot independently confirm these claims. Without verifiable certifications, it's difficult to assess the rigor and reliability of the testing process.
How Four Sail Compares
Compared to competitors like Nature Made (trust score 82/100, USP verified) and NOW Foods (trust score 85/100, multiple certifications), Four Sail's trust score is lower. These competitors often have more transparent certification processes and higher trust scores. However, some brands like Herbalife (trust score 60/100, no certifications) score lower than Four Sail. This information can help consumers decide "is Four Sail a good brand?"
Buying Guidance
Consumers interested in Four Sail products should carefully consider the brand's claimed third-party testing and lack of published lab results. Purchase from reputable retailers and check for any available "Four Sail reviews" from other users. Given the absence of GMP certification, carefully evaluate the potential risks before purchasing.
Frequently Asked Questions
Has Four Sail had any recalls?
Are Four Sail supplements third-party tested?
Is Four Sail safe?
Is Four Sail a good brand?
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.
Nordic Naturals ProOmega
Grade A+ • Higher score
Renew Life Digestive Enzymes
Grade A+ • Higher score
Sports Research Collagen
Grade A+ • Higher score
Qunol
Grade A+ • Higher score
Absolute Collagen
Grade A+ • 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 Four Sail's verified trust score and links back to this profile page. Helps show buyers you're transparent about third-party testing.
<iframe src="https://supplementchecker.co/embed/four-sail/" width="220" height="110" frameborder="0" loading="lazy" title="Four Sail trust score by SupplementChecker"></iframe>
<iframe src="https://supplementchecker.co/embed/four-sail/" width="320" height="160" frameborder="0" loading="lazy" title="Four Sail trust score by SupplementChecker"></iframe>
<iframe src="https://supplementchecker.co/embed/four-sail/" width="420" height="210" frameborder="0" loading="lazy" title="Four Sail trust score by SupplementChecker"></iframe>
Paste the snippet anywhere on your site. The badge updates automatically when Four Sail'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 Four Sail and 500+ other brands to find the ones that actually prove what's on the label.
See the best third-party tested supplements →Quick Facts
- Trust Score
- 75/100
- Grade
- B+
- Risk Level
- LOW
- Third-Party Tested
- Yes
- FDA Recalls
- 0
- Adverse Reports
- 0