I think: the content is a filler like the medical gel in Mass Effect, and its content ingredients should cover broad-spectrum fungicides (such as broad-spectrum antibiotics); the gel is used to stop bleeding and repair And the contents of fixed wounds, wall-mounted and medical kits/bottles are all the same. The drop of the ant lion larvae in Half 2EP2 should be similar in nature to it, after all, it is secretion. It is speculated that the method of use is to introduce it into the body through the interface on the HEV suit. After all, being fucked by a black headhunter crab will prompt for morphine injection, right? Or spray directly on the wound. This kind of medical supplies and snake oil settings are still very common in many games and animation works.
M.S.E is speculated to be
Medical Supply Ejection
The following is taken from the Mass Effect Galactic Encyclopedia for reference
Medi-Gel
Medical gel
Medi-gel is a medical drug commonly used by paramedics, emergency doctors, and the military. It is a mixture of useful ingredients: local anesthetics, antiseptics, and coagulants. Once applied, medical gel adheres to the wound until it is exposed to ultrasonic frequencies. Medi-gel seals against water – especially blood – as well as contaminants and toxic gases.
Medical gel was invented by the Sirta Foundation Genetically engineered protoplasm, Sirta Foundation is a large medical technology enterprise on Earth. Technically, Medi-gel violates the Council's Law Against Genetic Engineering, but so far, its practical effect is far greater than the ban.