The Ordinary Niacinamide vs Good Molecules Niacinamide Serum

What is different?

Compare the same bottle size before deciding which is cheaper, because a smaller bottle can win a price contest by bringing less serum.

Which should you pick?

The Ordinary is the more direct choice for an oil focused routine: the brand includes its serum in its morning and evening routine for acne prone skin. Good Molecules positions its 5% formula for all skin types, including sensitive skin, with ectoin for hydration and barrier support. Choose by your main goal rather than treating the percentage as a score, because skincare bottles are not exam papers.12

You do not need 10% niacinamide to get a useful effect. Lower concentrations have clinical evidence: a 2% moisturizer reduced oil production, and 5% topical niacinamide improved pigmentation and texture. Those are general ingredient findings, not a reason to expect either bottle to outperform the other.4

How do you use them?

1. 1Cleanse first. If you use toner, Good Molecules places toner before its serum.
2. 2Apply the serum at the treatment stage. Good Molecules tells you to use a few drops morning and night, avoiding the eye area. For The Ordinary, follow the amount on your bottle.
3. 3Let the Good Molecules serum fully absorb before applying other products, then follow with moisturizer.
4. 4Finish your morning routine with sunscreen. Niacinamide does not prevent sunburn.

If you mean the standard Good Molecules Niacinamide Serum, its directions also call for a few drops morning and night, full absorption before other products, and avoiding contact with eyes. Do not use the 5% formula's ingredient list to identify the standard serum.3

How long should you give it?

Think in weeks rather than applications. General niacinamide research found reduced oil production after 4 to 6 weeks with a 2% moisturizer and improvements in pigmentation and texture over 12 weeks with 5% topical niacinamide. These are useful time frames for setting expectations, not exact schedules for these serums. Clinical trials also support topical niacinamide for uneven pigmentation and signs of skin aging.45

What if your skin gets dry?

Patch test before introducing a new product. Niacinamide is generally well tolerated, but twice daily use can be too drying. As general niacinamide guidance, reduce use to once daily or every other day if excessive dryness develops rather than forcing the morning and evening schedule.145