There's no single 'correct' answerit depends entirely on the dosing protocol for your study
Just make sure to swab the stopper again before the second puncture and use proper sterile technique throughout
B12 injections contain only vitamin B12, while B complex injections include a combination of multiple B vitamins, typically B1 (thiamine), B2 (riboflavin), B3 (niacin), B5 (pantothenic acid), B6 (pyridoxine), and B12 (cobalamin), among others
This is usually mild and will wear off quite quickly Vitamin b12 shots can often undo symptoms of a low vitamin b12 level~ but the issue is that you might not have any idea that your B12 levels are low
It was built in the mid-15th century and it is believed that it was one of the residences of the ninth Inca of Tahuantinsuyo, Pachactec (Considered the great transformer of the Inca empire), although it also contains the remains of a great Sanctuary (Sacred Place where worshiped its various gods, especially the Sun God), with various temples such as: Temple of the Sun, Temple of the 3 Windows, Temple of Pachamama, Inti Huatana, the Royal Mausoleum, among others