Allergic Reactions to B12 Injections Though rare, anaphylactic reactions (strong allergic responses) have been reported to either cyanocobalamin or hydroxocobalamin
Too much caffeine may cause high blood pressure, rapid heartbeat, nausea, vomiting, nervousness and trouble sleeping
Astrocytes in the regulation of cerebrovascular functions
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Its also possible to feel a bit restless or tired, particularly if DSIP is taken too close to bedtime
Now, while injectable B12 is generally very safe, it is important to be aware of potential side effects