How many 1000IU of B12 to equal 2.4mcg?

To convert the units, it's important to know that 1 microgram (mcg) of vitamin B12 is equivalent to approximately 40 International Units (IU). Therefore, to equal 2.4 mcg of B12, you would need about 96 IU (2.4 mcg x 40 IU/mcg). Since 1000 IU is much larger than 96 IU, 1000 IU of B12 is far more than needed to meet the 2.4 mcg requirement.