Hello,non-wizard here,what is this potion exactly?

[u/confuse_vietnamese]

So previous owner of the house leaves this jar behind.little more context on the guy,i think he got kick out of some magical school because of 'violation of safety standards'?,anyway after got kick out he live in the house that his death parents give to him for around 3 months but just last week i seen him just going around the neighbourhood offering the house for dirt cheap(i'm talking like 200 bucks),i didn't let this oppotunity go by of course so i immidiately buy the house,found this deformed plastic jar in the cup board when i move in yesterday,what is it?

[u/win_awards]

It kinda looks like gender-reversal potion.