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If you have trouble with nutrient absorption due to the presence of intestinal inflammation, poor gut health, or a deficiency of those intrinsic factors we mentioned, then taking an oral supplement may not be that helpful
Muscle spasms can affect any muscle of the body, ranging from slight twitches to agonizing cramps that have a major negative impact on your quality of life
Long-Term Risks of Vitamin B12 Overdose Persistent skin issues Nervous system irritation Blood pressure changes Increased cardiovascular stress excessive supplementation without medical oversight
doi:10.1201/9781315119540
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