The comprehensive coverage principle should be used to judge patent infringement.
Suppose your patented formula has the following components: A, B, C, D, E, F, G, H;
Someone has adopted the following formula: A ,B,C,D,E,F,G,H,M. The newly added M does not achieve better technical effects, or overcomes certain technical prejudices, or solves other technical problems, or although it increases technical effects, this is something that technicians in the field know. For example, M is Diffusion agent, then although the diffusion effect of the formula is increased, it is still infringement.
Suppose someone uses the following formula: A, B, C, D, E, F, G, M, then it does not constitute infringement. Therefore, the drafting of a patent is not only a technical issue but also involves legal issues, so it is best to entrust a specialized agent to handle it.