But don't the forms the players signed only mention it as Thymosin no one knows if it was the alpha or beta 4 version.
The issue with this is that there's fingerprints all over Beta 4, with its associated compounds having been purchased by those involved and delivered to the chemist; while there are no records on Alpha associated compounds having ever been purchased or delivered to those involved. With ambiguous records stating that at least one of these substances was administered, it seems unlikely that it would be the one you've never been in possession of, while not being the one that was in your possession.
Then we have the unsigned letter back-dated to February, that Dank sent to the chemist in June after receiving advice that Beta 4 was a prohibited substance, with some comments about Alpha, before having the letter returned with signature attached this time, in late June. Dodgy as **** that one.
It seems far more likely than not, if this info is correct, that players were injected with Thymosin Beta 4.