Interesting that it has Mg, a lot of fertilizers don't. By ingredients I was looking for the chemical names e.g. ammonium sulfate, urea, potassium phosphate, things like that . But it's not really necessary if the plants look like they'll be ok based on the middle leaves growing. Without knowing what the "secret" ingredient is, and probably even if I did know, I still wouldn't give new transplants any fertilizer immediately.
