The amount of B12 a person needs depends on their age and pregnancy status, and can be broken down as follows: Children 13: 0.9 microgram (mcg)/day Children 48: 1.2 mcg/day Children 913: 1.8 mcg/day Teens 1418: 2.4 mcg/day Adults: 2.4 mcg/day Pregnant people: 2.6 mcg/day People who are breastfeeding: 2.8 mcg/day While these are general recommendations, some people may need more than others based on several factors, including: Diet Certain medications Difficulty absorbing B12 into the body Age (older adults may need more) People with certain health disorders, such as gastrointestinal disorders, autoimmune diseases, and anemia People who have had stomach or intestinal surgery People in the above-mentioned groups may need more than the daily recommended allowance, but those in the general population do not, and taking more vitamin B12 than you need is unnecessary

Instead, AOD 9604 is used to study downstream metabolic processes, particularly adipose tissue signaling and lipid metabolism, without activating the broader endocrine cascade associated with the GH axis
If you need to recover quickly from an illness that depleted your B12 reserves or have recently discovered you have a B12 deficiency that is impacting your quality of life, one solution is to give your body a larger dose of B12 all at once
In cases where a chronic condition is causing a deficiency, people may require B12 shots around every month