a common problem with injectables is crystallization and degradation, especially Test Cypionate and Test Enanthate.
However, chances are you probably have AT LEAST 90% potency remaining in your compounds. Only a few are unsafe but this applies mainly to some antibiotics. Injections, in general, as they are dissolved drugs usually last less than tablets or capsules but hormones like testosterone are often dissolved in oils which avoid the use of water and are much longer lasting. Hormones in general do not degrade into harmful products.