The B12 is absorbed more slowly, helping keep levels steady over time
However, these do have to be prescribed and administered by a healthcare professional, and are more likely to be given to people who have lifelong conditions affecting their ability to absorb B12 or who are at higher risk of consistent deficiency
To achieve blood levels of at least 30 ng/mL, adults living at temperate latitudes (think: anywhere with distinct seasons) need 800 to 1,000 IU per day, ideally from vitamin D3, which is more effective than D2
Always check with your insurance first
Initially, some patients might need weekly injections, while others might benefit from monthly maintenance dosages
This process reduces caloric intake