I just started GHK-CU and could I be allergic? After I give shot, in the area of injection it is really sore(painful) then I will get a knot and a big brown circle. Opinions appreciated. Kinda of painful. Should I take Benadryl?

Can I keep the remainder for next use? If so, would you put it in the refrigerator?

Is there a peptide anyone would recommend after you reach your desired weight for maintaining and not gaining back? I have hypothyroidism, and post menopausal so my energy and metabolism is terrible!