hii, i am using hair signals/folligen for blondes at night and during the morning i add nutrifolica serum without washing my hair....there is any problem with that?

It should be OK but post the ingredients of nutrifolica serum and I can give a better answer.

Saw Palmetto, Capsicum, Habenero, Green Tea, Horsetail, Sage, Ginger, Nettles, Glycolic Acid, Sea Kelp, Ginko Biloba, Lotus, Fenugreek, Myrrh, Alpha-Hydroxy, Aloe Vera, Vitamins A, E, B6, Hydrolyzed Wheat Protein, Hydrolyzed Wheat Starch.
thanks!

There will be no problems with that product.