SKU: 68369005856

COSRX The Niacinamide 15 Serum 20ml

Sale price$19.80 Regular price$22.00
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Ships within 48 hours · Estimated delivery Aug 13 - Aug 18

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Description

COSRX The Niacinamide 15 Serum 20mlProduct Description: Complete acne care with 15% niacinamide. The highly concentrated 15% niacinamide serum formula is blended with Acetyl Glucosamine and Zinc PCA for comprehensive acne care. It is easily absorbed by the skin and helps to regulate excess sebum production, even out skin tone, and improve skin texture. Non comedogenic does not clog pores. Product Benefits: Regulates excess sebum production Evens out skin tone and enhances radiance

Product Description: Complete acne care with 15% niacinamide.

The highly concentrated 15% niacinamide serum formula is blended with Acetyl Glucosamine and Zinc PCA for comprehensive acne care. It is easily absorbed by the skin and helps to regulate excess sebum production, even out skin tone, and improve skin texture.

Non-comedogenic – does not clog pores.

Product Benefits:

  • Regulates excess sebum production

  • Evens out skin tone and enhances radiance

  • Improves skin texture and reduces irregularities

  • Works on all stages of acne

Skin Type:

  • Oily, combination, or acne-prone skin

  • Individuals with excess sebum production and large pores

  • Those looking to treat acne from early to late stages

Size: 20 ml

Usage: Morning and evening

  1. Wash your face.

  2. Apply a few drops to the face.

  3. Gently massage in with fingertips, starting from the center of the face and working outward.

  4. When used in the morning, always follow up with sunscreen SPF 30 or higher.

Important:

  • Recommended not to be used in conjunction with other strong active ingredients such as AHA, BHA, or Vitamin C to avoid irritation.

  • Avoid contact with the eye and mouth areas.

Patch Test Always perform a Patch Test to check if your skin may react negatively to a new skincare product.

  1. Apply a small amount of the product to the skin, for example, behind the ear or on the inside of the wrist.

  2. Leave the product on for at least 24 hours without washing it off.

  3. Regularly check the area to see if any redness, itching, swelling, or other reactions occur. If a negative reaction occurs, discontinue use immediately and consult a doctor if necessary.

  4. If the skin feels normal and shows no reactions, you can start using the product as usual.

Precautions

  • Do not use the product if you are allergic to any of the ingredients.

  • The product is only for external use. Do not ingest.

  • Keep out of reach of children and animals.

  • Avoid contact with the eyes. In case of contact, rinse thoroughly with water and consult a doctor if necessary.

  • Do not use on damaged or irritated skin.

  • In case of signs of a negative reaction to the product, such as redness, itching, swelling, or other reactions, discontinue use immediately and consult a doctor if necessary.

Ingredients

Water, Pentylene Glycol, Niacinamide (15%), Butylene Glycol, Acetyl Glucosamine, 1,2-Hexanediol, Zinc PCA, Trehalose, Xanthan Gum, Pullulan, Allantoin, Ethylhexylglycerin, Sodium Phytate, Citric Acid, Tocopherol

Please note that ingredients and content may change over time. This means that the ingredients listed on our website may differ from those actually in the product. Always read the ingredients on the package before use. If you have any questions or concerns, please contact our customer service.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 68369005856

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4.1 ★★★★★
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Verified Purchase
Over and Under
Alexandria, US
★★★★★ 5
The Black and Decker BESTA510 is a KEEPER plus it's made in the USA 🇺🇲
Style: String Trimmer
Well folks🙂 I have to tell you this has been a nice weed eater that cuts really good and it's LIGHTWEIGHT and it's powerful👍 and at a PRICE that can't be beat...it's way more powerful than some battery and electric weed eaters that I have.. like a Ryobi... And supposedly a commercial grade Ryobi $200 😤.. Anyway 🙂 This electric weed eater is very good and I'll take that PEPSI challenge any day 😀 when comparing it to some other weed eaters PLUS it doesn't USE LINE like other electric weed eaters that I've used.. at least that's been my experience.. This is a KEEPER weed eater from Black & Decker👍....it handles tall grass and even some hedge... though it probably shouldn't be used for hedge but it's TOUGH 😀 and better than any battery weed eater I used especially with the power and cutting... The power alone and convenience of NOT rushing through the job with the battery pack and charging ect imo is worth the cord drag 🙂... and much better than a battery weed eater or other electric weed eaters.. This just cuts better 👍... With MORE power consistently and constantly through the whole job... So in conclusion 🙂 the Black & Decker BESTA510 weed eater in my opinion is a KEEPER and this model has been around for a while which speaks for itself not to mention Black & Decker has been around for years.... This weed eater OVERALL (pound for pound ) is a solid performer with many mostly liking this weed eater and Black & Decker products overall.. Thanks for reading🙂.. I hope my review helps... and Did I mention It's made in the USA...🇺🇲..🙂...
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Reviewed in the United States on September 6, 2025
L
Verified Purchase
Lucas B Hager
Draper, US
★★★★★ 5
No problems all the way to the end of the spool
Style: String Trimmer
I had an old Greenworks string trimmer that I found in the basement after I moved into my new home. Maybe it was just old, but the auto-feed didn't work well, the line was always running out, and I spent more time rewinding the spool than cutting down weeds. I had almost lost my faith in string trimmers entirely. You can spend $300 on one, but how much better are they? I didn't know. This Black & Decker was only $50, and although it's corded, my roommate convinced me it was worth not having to do the dance of recharging batteries, plus having full 110v power. Some (easy) assembly required out of the box, and this thing was basically plug & play. I did read through the owner's manual first, which gave amateur me some confidence through a few helpful tips. I use it not only for cutting down weeds, but also for cleaning out weeds from the cracks in my sidewalk, and the edger wheel is very helpful for that. More importantly, the line had no problems all the way to the end of the spool. Faith restored, there are good string trimmers in the world. That being said, be aware that the line it comes with isn't very long. My lawn is medium-size, and it ran out about halfway through. The Black & Decker replacement spools are $10 / 30 ft (much longer), but it goes through line, so this could really add up. Replacing the spool was easy, and I was able to finish my lawn with plenty line to spare. A quick search on Amazon reveals off brand spools at $15 / 12-pack. I haven't tested them yet, but the price difference is so great that I'm going to give them a chance.
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Reviewed in the United States on August 19, 2023
T
Verified Purchase
TinaMarie
Phoenix, US
★★★★★ 4
Handy until I can purchase a mower
Style: String Trimmer, Style: String Trimmer
I've used this thing heavily 3 times now. I need a mower but haven't had the spare money for one yet so this is what I'm using! My yard is just under 1 acre. I'ma list some pros and cons I've noticed in my good use.. Pros: it works.. really well! As you can see I live in Florida so grass grows super fast in our rainy season if I slack just 2 weeks oh my.. the power is strong, it's easy to work. Auto feed is a big help. I bought extra when I made this purchase I can go through about 1-2 rolls throughout the whole yard. Cons: the wire. It gets in the way so much and my large yard I use a 200 ft cord but that's not always enough so I can't complete my job completely but enough I'm happy with. When the auto feed is low i noticed it constantly over feeds the line and that honestly hurts sometimes! It's and easy fix but after doing it 5 times you're over it. Id just put a new one on but I feel that's just a waste. In the future I will be replacing mine to get rid of the wire.
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Reviewed in the United States on June 26, 2025
L
Verified Purchase
LL-SDGO
Phoenix, US
★★★★★ 5
Light Weight = Maneuverable
Style: String Trimmer
First time use today. It's works great. The light weight makes it so much more maneuverable than my very heavy 15 year old Echo weed line trimmer with heavy 58V battery. The Echo 58V battery died and did not want to spend $220 for new Echo battery with probably old tech battery. Debated on $300 EGO 56V trimmer and this corded 120VAC Black and Decker weed line trimer for $52. Also purchase a 50 ft AWG14 extension cord. The combination is terrific. Again the light weight is a revelation for me. The 6.5 Amp motor is plenty powerful. The thinner .065 line works well cut everything that needed wacking. The auto line feed works well. The length of tool fits me perfectly - I'm 5-4 so it may not be so good for tall folks. I extended to its max length. I wrapped the extension cord a few loops around the trigger handle and had no issues with cord staying on. Highly recommended with one could deal with extension cord. I don't see an issue with reliability and longevity. The electric motor seem well spec and strong. Really not much to go wrong with it. And no battery to deal with. For my very small yard it works great.
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Reviewed in the United States on March 5, 2026
A
Verified Purchase
Avid Reader
Port Orchard, US
★★★★★ 5
Great Light Weight String Trimmer and Edger!
Style: String Trimmer
I'm a 60 year old female and bought this because of the light weight. It was easy to put together, however, the instructions that came with it were terrible. It included only black and white images, with no written instruction. I found a great tutorial on YouTube that told how to assemble it and use it, and another on how to change the string. Buy extra string, so you'll have it ready! It does a great job on weeds and ivy. The edger is great. It is adjustable, but probably not the best for anyone taller than 5'6. It's noisy, but not so bad that it requires ear protection. I like that it's corded which makes it lighter and I don't have to fool with gas or heavy batteries.
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Reviewed in the United States on May 8, 2026

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