O Cosmedics
O Cosmedics B3 Plus 30ml
O Cosmedics B3 Plus 30ml
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O Cosmedics B3 Plus is a high-performance Niacinamide serum designed to address uneven skin tone, hyperpigmentation, redness, breakouts and visible signs of ageing while strengthening the skin barrier. At its core is 12% Niacinamide, helping regulate excess oil, improve moisture retention and calm visible redness for clearer, more balanced and resilient-looking skin.
The multi-corrective formula pairs Niacinamide with 5% Sodium Ascorbyl Phosphate Vitamin C and B-White peptide technology to target dullness, dark spots and uneven pigmentation. Trylagen® provides complementary collagen support, helping improve firmness, elasticity and the appearance of fine lines while antioxidant activity helps defend against environmental oxidative stress.
Its water-light texture absorbs quickly and layers easily with other corrective skincare, making B3 Plus suitable for both morning and evening use. The streamlined formula provides broad corrective support without adding unnecessary weight or complexity to the routine.
Product Size: 30ml
SKIN DEEP MEDISPA EXPERT VERDICT
Our rating: 4.9/5
O Cosmedics B3 Plus is one I recommend across a surprisingly broad range of skin concerns, but I particularly like it when pigmentation or post-breakout marks are occurring alongside redness, oiliness or a barrier that needs strengthening. I find the 12% Niacinamide particularly useful when oil balance, barrier strength and uneven tone all need attention, while the Vitamin C and targeted peptides extend the formula into pigmentation and collagen support. I also find it useful when someone wants meaningful correction but doesn't need a routine built around several highly targeted serums. It layers easily, works morning or evening and gives me plenty of flexibility to build the rest of the routine around whatever concern needs more specific attention.
BEST FOR
Uneven Skin Tone • Redness • Excess Oil • Enlarged Pores • Ageing
I wouldn't automatically choose B3 Plus when one concern clearly requires a more specialised treatment. Significant dehydration, persistent congestion or more advanced age-management concerns may warrant a different primary corrective. I see B3 Plus as particularly valuable when the skin needs better balance and resilience alongside visible correction.
Reviewed by: Diana / Founder & Head of Clinical Therapies, Skin Deep Medispa, Armadale
🔥 OUR HOT TIP
If you're using B3 Plus for pigmentation or post-breakout marks, take progress photos rather than judging your skin day to day. I recommend using the same lighting every few weeks. Pigment correction is gradual, and consistent photos make changes in tone and clarity much easier to assess than checking the mirror every morning.
Not sure if it’s right for your skin? Ask A Skin Deep Medispa Therapist
What We Love
What We Love
Key Ingredients
Key Ingredients
How To Use
How To Use
Pair It With
Pair It With
FAQs
FAQs

“I bought this mainly for pigmentation left behind after breakouts, but I've noticed my skin is generally much calmer as well. My tone looks more even and I don't get as oily through the afternoon. It has become one of those products I use every day without really thinking about it.”
Sophie, Kilsyth VIC
“I have quite reactive skin and was nervous about the 12% B3, so I started using it once a day. It's been great for me. The redness around my cheeks has settled and my skin feels much less temperamental overall. The texture is also lovely under moisturiser and makeup.”
Evelyn, Newcastle NSW
“I've been using this morning and night for about two months, mainly for some sun spots and uneven tone across my cheeks. My skin definitely looks brighter and more even now, and I really like how light the serum feels. It disappears into my skin straight away and sits well under everything else I use.”
Kate, Perth WA