What is the best Niacinamide product? Does Niacinamide work?

[BucketCrab]

Title.
I'm looking to add this ingredient to my skincare routine, have you found it effective?
What product are you using?
Can it be used with Tretinoin as well?

 

[Orc]

it's in my sunscreen.

 

[Gaygymmaxx]

it's in my sunscreen.

Same

 

[copemachine]

Title.
I'm looking to add this ingredient to my skincare routine, have you found it effective?
What product are you using?
Can it be used with Tretinoin as well?

Any product that contains 5% niacinamide is ideal. Any more doesn't have any benefits and is just irritating. It can be used with tretinoin. I have niacinamide in my cleanser.