Fake tamoxifen?

Hello have endured gyno problems but it’s minor. Just pain and puffiness . Got some anastrozole legit one, the have read it that should use tamoxifen because it’s less harsh on estrogen. Then got bottle of verry weird tamoxifen . After it got much more pain in the nipples can it be fake ?

They do different things.
Arimidex is an AI.
Nolvadex is a serm.

One reduces estrogen, one blocks the estrogen receptor, specially in the breast tissue.

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