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Why it's flagged
The belief that niacinamide + vitamin C form an ineffective complex comes from old studies at very high temperatures, not representative of a real routine.
What Haru suggests
You can use them together without issue. If your skin reacts, this combination isn't the cause — look at concentration instead.
How settled this is
Popular mythA widespread belief that isn't actually supported — these are fine to use together.
Based on general cosmetic consensus — not on your products' specific concentrations, which aren't disclosed and are never inferred from the ingredient list order.
These recommendations are general and don't replace advice from a dermatologist, especially for sensitive skin or a prescribed treatment.