recommended injection dose of b12 Vitamin Dosage for Adults: Guidelines How Vitamin B12 Injection Dosage
Description
If 1% works, surely 3% works three times better

This means that livestock can be sold for slaughter even the day immediately after treatment, should market prices suddenly increase
The Cochrane Collaboration, Chichester, UK: John Wiley & Sons

Prescription required

The speed at which you experience a pick-me-up after a B12 injection can vary depending on a few factors: The Severity of Your Deficiency If you have a mild deficiency, you might feel a difference in energy levels within a few days to a week

Each has its own evidence base and safety boundary