Is it okey to use The ordinary Niacinamide10% zinc...

is it ok to use Niacinamide10% zinc 1% with vitamin c night cream with Niacinamide and Tea tree tone ?
yes its ok , all those products and supplemint-like products , no expect medical interaction between 
is its useful to use those products together ?
using those products together may be helpful of enroushiment skin and keep it moist , but there is no expect benefit beyond that 
can you apply them everyday ?
yes , its ok to use them daily , those products dont have any severe side effects , you may feel a little bit uncomfortable after using them , but usually its self relieved symptoms 
how to know your skin type precisly :
1. Wash the face completely  and dry it appropriately
2. Wait an hour and then start the next step
3. Use a tissue to press the areas of the face, such as the cheeks, forehead, and nose
4. check the tussue after that and know the results :
A normal type: no signs or results appear on the tissue 
B. Dry type: there are no signs on the tissue, and some dandruff may appear on the face or tissue area
c. oily type: the appearance of fatty secretions on the tissue
D. Mixed type: the appearance of only secretions only when using a tissue in the forehead and nose area