Usually young person does not require any external digestive enzyme intake to promote digestion.
digestive enzymes will only help you if you have some in digestion problem.
If you are underweight you need complete assessment of your condition.
There are multiple other factors other than lack of digestive enzymes for underweight.
Next Steps
check you BMI, if your BMI is normal you don't need any digestive enzyme support.
take good nutritious hygienic food and do regular exercises.
Health Tips
there is a stool test to estimate the level of indentation, you might not require it.
Dubai be more information so that I can help you.