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The buyer confirms that this product will be used exclusively for research purposes in an appropriate laboratory environment
Imagine how much longer that would be if you still had to ingest, break down, and absorb the B12 before the 12-48 hour period started
Authorities can save a portion of the blood sample (a blood split)
Allergic reaction: While rare, some individuals are allergic to injectable formulations or preservatives
That is exactly why they are used under medical supervision with realistic expectations, and why a provider, not a marketing page, should decide whether they fit your case
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