Grade: D

HIGH RISK

Stacker 2

Item: Stacker 2
Rating: 40
Author: SupplementChecker

Stacker 2 has a Trust Score of 40/100, which translates to a Grade of D and a HIGH Risk Level. Stacker 2 does not claim to offer third-party tested supplements. Consumers should be aware of the limited safety and quality information available for this brand.

Stacker 2 Trust Summary

Trust Score: 40/100 (Below Average)
Grade: D
Risk Level: HIGH
Third-Party Tested: No
FDA Recalls: 0
Adverse Events: 7

Stacker 2 has a trust score of 40/100 (Below Average). The brand is not third-party tested by NSF, USP, or Informed Sport, has no FDA recalls on record and 7 adverse event reports.

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Red Flags

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

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

Is Stacker 2 Third-Party Tested?

No — Stacker 2 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 Stacker 2 a Good Brand?

Stacker 2 scores 40/100 (D) — this is a below-average score. We recommend considering brands with third-party certifications like NSF or USP. Stacker 2 has a clean FDA record with no warnings or recalls. The brand does not currently hold third-party testing certifications.

About Stacker 2

Stacker 2 is a supplement brand operating independently in the US. The founding date is unknown. They offer a variety of supplements in the specialty category.

Product Specialization

Stacker 2 specializes in the specialty supplement category. Specific product types are not detailed, but the brand focuses on supplements targeting specific needs.

Testing & Certifications Explained

Stacker 2 does not claim to have any third-party testing certifications. This means that there is no independent verification of the ingredients or potency of their products. Consumers cannot be certain that the products contain what the label claims or that they are free from contaminants. The absence of GMP certification also raises concerns about manufacturing quality control.

How Stacker 2 Compares

Compared to brands like Nutrafol (Trust Score: 72/100) and Klean Athlete (Trust Score: 88/100), Stacker 2's trust score is significantly lower. These competitors often feature comprehensive third-party testing and certifications, providing greater assurance of product quality. Consumers researching "Stacker 2 reviews" should compare the brand against competitors with higher trust scores and transparent testing practices.

Buying Guidance

Given the low Stacker 2 trust score, consumers should exercise caution when considering their products. Look for third-party tested supplements from brands with higher trust scores. If you choose to purchase Stacker 2 products, carefully evaluate the ingredients and potential risks.

Frequently Asked Questions

Has Stacker 2 had any recalls?

No — as of 2026, Stacker 2 has zero FDA product recalls on record. Stacker 2 received a trust score of 40/100 from SupplementChecker.

Are Stacker 2 supplements third-party tested?

No — Stacker 2 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 Stacker 2 safe?

Stacker 2 received a trust score of 40/100 (grade: D, risk level: HIGH). 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 Stacker 2 a good brand?

Stacker 2 scores 40/100 (grade: D) — 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.

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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.

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