While there is no single "magic hour," consistency is the most critical factor
doi:10.3109/00016349109007165
Is your recovery from exercise improving
Braaks staging theory, backed by postmortem and animal model evidence, suggests that misfolded -synuclein aggregates initially arise in the enteric nervous system (ENS) and olfactory bulb, then spread to the midbrain following trans-synaptic transmissions through the vagus nerve [15]
Similarly, an exogenous GSH-induced improvement of activities of antioxidant enzymes reduces oxidative stress under various abiotic stress conditions 26,27,28
While a multi-active product is probably the best way to combine the two ingredients, you can also combine azelaic acid and salicylic acid together in the following ways: Salicylic acid cleanser, azelaic acid serum, moisturizer, (sunscreen if AM) Cleanser, salicylic acid serum 1-3x a week and azelaic acid cream on the other days, moisturizer, (sunscreen if AM) Cleanser, salicylic acid serum (1-3x a week) AM/ azelaic acid PM, moisturizer, (sunscreen if AM) If using both azelaic acid and salicylic acid as serums it doesnt really matter which way round you use them