Intravenous milk injection
Injection of milk in English is often referred to as "milk fortification" or "milk adulteration," depending on the context. If you're talking about injecting milk with substances for fraudulent purposes, it might be called "milk tampering" or "milk spiking."
Shot milk. 或 Injection milk.
这两者都是直译,但在实际使用中,可能更常见于“注射型牛奶”这样的表述,即“injection milk”或“injection-style milk”。如果是说将牛奶制成注射剂的形式,可以用 "milk in an injectable form" 或 "injectable milk solution"。