Yes there are a few ways this can happen. One is that hCG is very unstable in liquid form. That’s the reason it’s put into powder form before you get it in your vial (called Lypholization – watch the pharmacist explain this process to us here!) Once the hCG is mixed up by you, the guesstimate is that it stays usable (as long as you keep it in the fridge at all times except when you use it to get your injection) for about 4 weeks or so. Usually after 4 weeks, it’s always a good idea to re-mix your hCG, even if you have some left. You can often start to tell that it’s losing potency because you’ll get hungrier and having issues with weight loss. I have re-mixed my hCG at 3 weeks many times just to be safe.
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