Both contains niacinamide but tiam contains a higher percentage (10%) and axis-y contains 5%. I would use them in different routines morning-night or on alternative days. 

Use them every other day. One has 
5% niacinamide and the other has 10%. Both at the same time is too much.

Does Tiam Vita b3 source and Axis dark spot correcting glow serum are almost same?? Because both have Niacinamide in them. 
Can I use them in alternative days??
Or Should I finish one and then use the other one?

Vita B3 VS Dark Spor Correcting Serum

AXIS-Y
Dark Spot Correcting Glow Serum

TIAM
Vita B3 Source

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Vita B3 VS Dark Spor Correcting Serum

AXIS-Y Dark Spot Correcting Glow Serum

TIAM Vita B3 Source

Join the Picky Community

AXIS-Y
Dark Spot Correcting Glow Serum

TIAM
Vita B3 Source