does b12 have to be injected intramuscular

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How can I confirm an agreement discussed by phone or in person?

Ask for clarification when you are unsure about exact wording. Keep copies of the seller's response with the order records.

How can I assess an important claim made about a product?

Check whether the evidence concerns the actual product rather than a related offering. Look for relevant limitations in the full documentation.

How should I interpret a seller's deadline when the time zone is unclear?

Ask which time zone applies to the stated deadline. Confirm the deadline again if the arrangement has been amended.