percentage of copper in ghk-cu 99% Pure Peptides (ghk-cu) | Great for DIY - 1 Gram GHK-CU vs Other Copper Peptides:

In people with vitamin B12 deficiency, symptoms may include fatigue, lack of energy, dizziness, shortness of breath, irregular or fast heartbeat, pale or yellowish skin, numbness or tingling in the hands and feet, smooth or tender tongue, decreased appetite, weight loss, diarrhea, muscle weakness, unsteadiness, trouble walking, mental confusion, forgetfulness, irritability, and personality changes

However, your dog may exhibit a number of mild symptoms that should go away within a week

Or getting out of the EU lol...That's the plan

The deltoid (upper arm) is also an IM site but can be harder to reach on your own

If you experience side effects from the shot, adjusting the dosage can be effective at reducing the occurrence