Source standard
Read a reference for the claim it supports, not as an endorsement of every conclusion on the page.
Specific support
A useful reference identifies the source clearly enough to inspect and explains why it belongs beside the statement. Primary material and official guidance are preferred when they directly answer the question. A review can be useful for synthesis without replacing the detail of the underlying evidence.
Subject similarity is not enough. A result about one population, ingredient or method may not transfer to another. The wording should preserve that boundary instead of using a credible source name to lend authority to a broader claim.
Read the limits
Look for what was measured, how it was measured and what the result leaves uncertain. An association is not automatically a causal explanation. A laboratory result may answer a different question from one about an ordinary kitchen or household.
A source can also change. Corrections, newer editions or withdrawn material may alter the support for a statement. Use the linked record and the context given on the article rather than relying on a source name in isolation.
Question a reference
If a source does not appear to support its accompanying claim, identify the page, statement and relevant passage. Explain the mismatch as narrowly as possible. A specific concern is easier to assess than a general challenge to the entire subject.
The contact route does not require a private document or personal record. Link to public material where possible, and do not upload copyrighted papers or confidential correspondence.