B12 injections, on the other hand, allow up to 100% absorption and immediate use by the body
This test uses a radioactive form of B12 to see if your body has enough intrinsic factor
Seek urgent medical attention (via NHS 111 or 999 in an emergency) if you experience severe or persistent abdominal pain, persistent vomiting, signs of dehydration (such as dizziness, reduced urination, or extreme thirst), or symptoms suggestive of low blood sugar (such as shakiness, sweating, or confusion)

Although the precise rate of absorbability relies on the individuals gastrointestinal health, below are the top food sources that give vitamin B12 (with portions based upon 2.4 milligrams daily for adults): Beef as well as poultry liver (1) 3 ounces: 81 milligrams (3,375% RDA) Salmon (2) 1 filet (108 grams): 19.5 milligrams (812%) Herring (3) 1 filet (143 grams): 18.7 milligrams (779%) Mackerel (4) 3 ounces: 15.3 milligrams (637%) Sardines (5) 1 cup: 13.3 milligrams (554%) Tuna (6) 3 ounces: 9.3 milligrams (385%) Trout (7) 1 filet: 9.1 milligrams (379%) Organic yogurt (8) 1 container of ordinary Greek yogurt (170 grams): 1.3 mg (53%) Turkey (9) 3 ounces: 1.1 milligrams (43%) Raw milk (10) 1 mug: 1 milligrams (41%) Beef tenderloin (11) 3 ounces: 0.9 milligrams (38%) Lamb (12) 3 ounces: 0.8 milligrams (34%) Tips on How to Add More Vitamin B12 to Your Diet Regimen with Food