Some vendors provide in-house COAs, others use third-party labs. In-house is cheaper for the vendor but obviously less trustworthy. Third-party from an ISO 17025 accredited lab is the gold standard. Which vendors actually provide proper third-party testing? I've found maybe 3-4 that do it consistently.
Third-party vs in-house COAs — does it matter?
Did you get a COA with your order? I've been looking at this vednor but want to verify quality first. How long did shipping take?
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