DHT has water solubility of 525 mg/mL (at 25 °C) YALKOWSKY,SH & DANNENFELSER,RM (1992)
Have you tried with small amount in water to see if it's even standard DHT? My guess is it's some heptanoate as used by Russian Peptides Titan...
DHT isn't water soluble. DHT only has two oxygen atoms on its entire molecule. These two oxygen atoms can interact with water because of its electronegativity. However, because the rest of the molecule cannot interact with water, this renders DHT very insoluble in water. I think the 525 mg/ml is wrong. Testosterone has a soubility of 0.0234 mg/mL. The only difference between test and DHT is the addition of a hydrogen molecule on DHT's structure. This would not make any difference in solubility.
DHT is made from Cholesterol (A fat, ie very hydrophobic), the only difference is that it replaces the carbon tail with an hydroxyl group on one side, and an oxygen on the other. This makes DHT slightly more hydrophillic than cholesterol, but not by much. DHT is classified as a lipid (hydrophobic). Its not water soluble. If my dht dissolved in water, id be worried.