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Glossier Super Pure Niacinamide + Zinc Serum Dupes & Cheaper Alternatives

From 7 Reddit threads · Updated October 13, 2026

5% niacinamide serum with loyal long-term users; occasional wrecking reports. The catch: acne-prone users report sharply divided results, including skin being wrecked. Here's what Redditors reach for instead.

The short answer

  1. Niacinamide 10% + Zinc 1%
    Best Overall Alternative

    Oil control and pore shrinkage · $6.00 · 30 ml

  2. B-Bomb 10% Niacinamide Serum
    Same Active: Niacinamide

    Reddit favorite for calming oil production · $8.90 · 29.6 ml

#1

Best Overall Alternative

  • Key actives: Niacinamide 10%, Zinc 1%
  • Size: 30 ml

The why

Studies found topical niacinamide helps acne, and Reddit mostly backs that for oil, pores, and red marks. The catch is the 10% strength: lots of users report stinging, flushing, and breakouts, especially on sensitive or already angry skin.

One minus

10% is where the irritation starts for a lot of people

The original, at a glance

Why people love it
5% niacinamide; long-term repurchase favorite

#2

Same Active: Niacinamide

  • Key actives: Niacinamide 10%
  • Size: 29.6 ml

The why

A 10% niacinamide serum with Zinc PCA that Redditors use for oil control and routinely slot into AM or PM routines. Redditors call it the best niacinamide serum they know, yet some users report more oiliness and orange-peel texture.

One minus

High niacinamide can increase oiliness

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