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If you have severe abdominal pain (that may spread to the back), persistent vomiting, or signs of pancreatitis stop using and contact your healthcare provider immediately
On the downside, theyre more expensive and must be administered under the supervision of a healthcare professional ( Still, multiple studies have also found oral vitamin B12 supplements to be safe and effective ( Ultimately, consulting a doctor is the safest way to determine which vitamin B12 supplement is best for you
Functional Ecology
Global, regional, and national comparative risk assessment of 79 behavioural, environmental and occupational, and metabolic risks or clusters of risks, 19902015: a systematic analysis for the global burden of disease study 2015
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