The following comparison summarizes the key considerations: For patients with intact GI absorption, oral high-dose supplementation (1,000 to 2,000 mcg daily) provides a convenient and cost-effective path to correcting deficiency
Dietary Supplements Vitamin B-12 deficiency can be corrected by eating foods rich in B12 and taking dietary supplements, such as B12 supplements or multivitamins
Roopchand, D
In these cases, vitamin B12 injections offer a direct source of the vitamin, bypassing the digestive system and providing a faster, more efficient absorption
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That lack of energy is known as fatigue, and dealing with it all the time can affect your ability to feel motivated about doing anything, even getting out of bed