I think when applying the product to your face using the dropper, just make sure the tip of the dropper doesn’t touch any part of your skin to avoid contamination. Personally i would prefer a pump bottle. 
The percentage of niacinamide might be high for first timers, so if you have sensitive skin, do a test patch. 

I like the texture and how it absorbs into my skin.
I have dry skin and using this made my skin more moist.
This product contains niacinamide 10% and arbutin 2%. This two ingredients are great for for aging skin and keeps it plump. 
The packaging is an amber glass with dropper, so the product is protected from light. 

TIAM - mehsatry review for Vita B3 Source

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