why inject vitamin b12 Do You Need a Prescription for Injections? Vitamin B-12 Injectable Solution

And yes, you have to refrigerate them I got 100mg of GHK-Cu in a single vial (a 5mL vial I believe)

Some vitamin B12 supplements, such as liquid drops or sublingual tablets (tablets that dissolve under the tongue), may also need to be refrigerated to maintain their stability and effectiveness

Label every vial: peptide name, concentration (mg/mL or mcg/mL), reconstitution date, lot number, and operator initials

Drink more water, as adequate water intake is known to improve satiety and improve metabolism (15)

Long acting insulin which works after 2-3 hours but lasts for 24 hours

For example, while the injection covers B, B, B, B, B, you still need other vitamins (like vitamin C, B folate, B if not supplemented separately, etc.) and minerals (iron, zinc, etc.) from food