YZ: Writing original draft
Vendor evaluation checklist Before purchasing from any online source, work through this checklist: Batch-specific COA available with HPLC and mass spec data Purity documented above 98% via HPLC Mass spectrometry confirming correct molecular weight (4,731.4 g/mol) Third-party testing results available or offered Clear labeling as research use only Verifiable business identity and contact information Consistent pricing with market averages Proper shipping conditions (temperature-controlled when necessary) Return or replacement policy for quality issues Responsive customer service that can answer technical questions Checking every item does not guarantee a perfect product, but it eliminates the most common sources of quality problems
Research-grade products do not have to meet the manufacturing standards applied to approved injectable medicines
SIBO could lead to symptoms like bloating, excessive gas, or impaired absorption of nutrients
Vitamin E and the risk of prostate cancer: the Selenium and vitamin E cancer prevention trial (SELECT) JAMA
It is not a drug, food, cosmetic, or dietary supplement, has not been evaluated by the FDA
