Numbuzin
Numbuzin No.5 Shirotama Glutathione C Serum, 30ml
Numbuzin No.5 Shirotama Glutathione C Serum, 30ml
Rated 4.9 out of 7.0 by Japan’s largest beauty community
Shiratama Glutathione Series Serum
✓ 100% AUTHENTIC, SHIPS FROM JAPAN
✓ DUTIES & TAXES INCLUDED FOR US ORDERS
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What it is
A creamy-textured serum with highly concentrated glutathione C and niacinamide for clear, lustrous, white skin. Contains glutathione, ascorbic acid, ascorbyl glucoside. all skin conditioning ingredients. Prevents dullness caused by dryness with moisturizing effects.
Ingredients
How to use
After applying lotion, take an appropriate amount in your hand and gently apply to your skin.
We ship internationally from Japan!
Frequently Asked Questions
Is this authentic?
Yes. We only buy from official retailers and directly from the brands here in Japan. Never resellers, never grey market stock.
We are beauty lovers too, so we know the worry, especially with something you are putting on your face. Authenticity is 100% guaranteed by us.
What are your shipping rates?
On orders under US$75, shipping is a flat US$20 to the United States and US$10 to all other countries.
Orders of US$75 or more ship free, applied automatically at checkout. Your exact shipping cost is shown before you pay.
How long does delivery take?
These estimates are for International Airmail (Tracked) and include 3 to 5 business days of processing in Japan.
- United States: 12 to 15 business days
- Canada, United Kingdom, France, Germany: 9 to 12 business days
- Australia, New Zealand, Denmark, Finland, India, Indonesia, Italy, Netherlands, Spain, Sweden, Switzerland: 10 to 13 business days
- China, Hong Kong, Malaysia, Singapore, South Korea, Taiwan, Thailand, Vietnam: 8 to 10 business days
- Rest of the world: 11 to 18 business days
Actual delivery can be affected by customs clearance, seasonal congestion, or carrier delays in the destination country, all of which are outside our control.
Do you offer express shipping?
Yes. As of 22 July 2026, we offer International Express Mail through Japan Post. The cost is based on order weight and is calculated automatically at checkout.
Will I pay customs or import fees?
US orders: No. As of July 1, 2026, all US orders ship DDP (duties delivered prepaid), meaning we prepay all import duties on our end. Nothing is due at your door.
Orders outside the US: Possibly. Duties and import taxes are set by your local customs authority and are not collected at checkout, so any charges on delivery are your responsibility.
We're working on rolling out prepaid duties for more countries soon.
I'd been interested in this product for a while, so I bought it. It's easy to use morning and night, and although it's a little thick when dispensed with the dropper, it has a smooth texture and blends well with the skin. I tried using one bottle, but I didn't notice any whitening effect. I also realized partway through that I had purchased the Japanese version, which doesn't contain tranexamic acid. I'd like to try the Korean version next.
Numbers In No. 5 Shiratama Glutathione C Serum (30ml) - Full Bottle Review: I've used up the entire bottle of this serum, so I'll give you my honest review! I tried out the popular Numbers In No. 5 serum. The "Shiratama" (white ball) name led me to believe it would be quite moisturizing and heavy, but the actual texture is just the right amount of smooth and viscous. While it's thick, it's not sticky and spreads easily, making it ideal for dry skin during dry seasons or when you're concerned about dryness. After application, it leaves a pleasantly moisturizing feeling, almost soothing to the skin. Personally, I didn't experience any irritation, and I liked the fact that it can be easily incorporated into my daily skincare routine! It's easy to combine with other skincare products, and I found it to be a serum that's suitable for any season or skin condition. If you're looking for a serum that prioritizes texture, I think it's worth trying. #NumbersIn #numbuzin #5Serum #WhiteJadeSerum #GlutathioneSerum #Serum #UseItUpReview #HonestReview #SeriousReview #SkinCare #DrySkinCare #MoisturizingCare #ThickSerum #GentleToUse #DailySkinCare #IWantToConnectWithSkinCareLovers
I'd been interested in this product for a while, so I bought it. It's easy to use morning and night, and although it's a little thick when dispensed with the dropper, it has a smooth texture and blends well with the skin. I tried using one bottle, but I didn't notice any whitening effect. I also realized partway through that I had purchased the Japanese version, which doesn't contain tranexamic acid. I'd like to try the Korean version next.
I've bought this product countless times! I no longer have to worry about acne scars or pores! Whenever I'm worried about rough skin, I just apply this and it stops it from getting worse, so it's my personal go-to cosmetic!
I bought this with high hopes because I felt the effects were amazing when I used the yellow Numbers In bag. It feels quite smooth to use. My impression after using it was a bit disappointing...it didn't feel like my skin was happy! So I won't be repurchasing. It's disappointing considering how much it's been talked about.