is sublingual b12 as effective as injections Vitamin Sprays vs Tablets : What's the Difference? – Sona B12 Under the Tongue: Uses,

But if you have a 500 g supplement and only want to take B12 once a week, you can add 5 of them together to equal 2,500 g and match our EFSA recommendation

How its given and how often is very important for treatment

Recombinant GH (rGH) increases lean mass and lumbar spine bone density but, in healthy older adults, may raise the risk of diabetes, cancer, and fluid retention without improving muscle strength or physical performance [156]

Injectable B12 is often preferred because it bypasses the digestive system and delivers the vitamin directly into the body

These injections are not a substitute for lifestyle habits