The only possible issue with some protein powders, would be if they contained ingredients with things like bol, drol, ol, diol, dione or other similar sounding suffixes in the ingredient name, as they could be hormone based ingredients.
Most if not all however shouldn't contain these things.
Even if a powder, (and some do), contained Creatine. That is a natural component of Meat and Fish, and shouldn't cause issues to anyone in small doses.
Creatine will only cause issues if it's consumed too greatly, or consumed with a poor water intake, or if you drink Alcohol whilst on it, as Alcohol dehydrates, Creatine creates water retention, so opposing effects.
Creatine can convert to Creatinine, a toxic byproduct also produced by the Kidneys, but even then, for Creatinine levels, men have normally 0.7-1.2 ng /dl ,(Nanograms per Decilitre), a Nanogram being a billionth of a gram.
Women have normally around 0.6-1.1 ng/dl, Creatinine. So almost identical.
Toxic levels would be 10 ng /dl.
So a Protein powder would not cause issues for most, even with Creatine in it.. The only problems to be aware of is the fact Protein contains Nitrogen, which converts to Uric Acid, and Uric Acid in high and daily sustained, life long concentrations, can cause Gout, and high Protein ingestion can cause Kidney Stones. However the Gout can be contributed to by Nitrogen in Saturates, and Xanthines in Methylxanthine sources, like Caffeine, Theophyline and Theobromine, (Tea, Coffee, Guarana, Kola Nuts, Chocolate etc etc).
So if you had Gout, a Protein powder would be no-go. Low Protein diet then, conditional until otherwise relaxed.
Also if you had something like Phenylketonuria, a reaction to Phenylalanine, an essential Amino Acid, and a condition that occurs at birth for those who have it, a protein powder might be a slight issue.
Also if you had a Herpes Virus, as whilst Lysine helps with such things, Arginine hinders, so again, a possible problem.
That would include an active Simplex or Zoster, (Shingles, formally chickenpox), Virus, but shouldn't be an issue with a latent one, (a virus displaying no symptoms). I had Chickenpox in the past, never had Shingles, and no Protein powder, or moderately high Protein intake, has caused my any negative effects, that I have encountered.
There aren't any other contraindications with such a supplement, that I know of, but then this condition would be placed on high protein foods and liquids like Milk too, so don't worry about a Protein powder

.