FAS
(Restocking) FAS The Black AC Oil Serum, 30ml
(Restocking) FAS The Black AC Oil Serum, 30ml
@cosme rating: 5.8/7.0
A beauty serum that satisfies all adult skin concerns
✓ 100% authentic
✓ Ships from Japan in 3-5 days
✓ Duties prepaid for US orders
✓ Tracked delivery via Japan Post
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What it is
Fermentation science x the power of vitamins. A beauty serum that gives firmness and radiance to adult skin problems. Contains 31% of a unique ingredient made from fermented black rice. In addition to the 24 vitamins contained in black rice fermentation liquid, it is designed to be well-balanced by incorporating vitamin A derivative and vitamin C derivative. Even though it is an oil beauty serum, it has a smooth texture that is not sticky. Yeast extract. 1. moisturizing ingredient. Retinol palmitate, hydrogenated retinol. both moisturizing ingredients. Ascorbyl tetrahexyldecanoate, disodium isostearyl ascorbyl phosphate. both moisturizing ingredients.
Ingredients
How to use
After toning your skin with lotion, dispense one dropper's worth into the palm of your hand and apply it to your entire face, focusing on areas of concern.
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.
This oil is packed with serum ingredients and left my skin feeling moisturized the next morning. It has an oily feel, so as someone with extremely dry skin, this was a big hit for me and I think it will become an indispensable product, especially in the winter.
While it's classified as a serum, I'd call it a beauty oil. FAS's other whitening serum has the typical serum shape, but it feels completely different. This one is a golden-colored, heavy-feeling oil. It doesn't have much of a scent. The recommended amount is the size of a 100-yen coin, but a 1-yen coin was enough for me. It feels heavy in the hand, but it absorbs well and blends quickly into the skin. After it's absorbed, it leaves skin feeling very moisturized and plump and supple. I'd like to finish with a black cream, but perhaps due to the season, I feel like I'm layering it a little too much, so I layer a thicker serum (currently Shiseido's Vital Perfection Night Serum). This amount is just right for me. Since using this, I feel like my skin has become denser. I also feel like my skin has become more stable and stronger.
Maybe it was because I had high expectations for the lotion, but I'm not sure if I'll buy it again because it was so disappointing.
I happened to use a sample and loved it, so I bought it. The other products are included in the gift set, but I wanted this one on its own. Serums tend to be liquid-based. This oil is applied after toner, but even though it's oily, it's not sticky and blends well with the cream, which seems to enhance its effectiveness. It pairs well with the cream I use next, and my skin feels smooth and refined the next morning. I also like how it's non-irritating despite containing vitamin C derivatives, which are effective against pores. My skin gets super oily in the summer (May-October) and a little dry in the winter (November-February), so I'm changing my makeup routine. The winter ones tend to be sticky in the summer, but I think I can get by with just the right amount. Since a small amount is enough, it seems like good value for money. "Contains 31% black rice fermented liquid, a proprietary ingredient of FAS. It also contains two types of vitamin A derivatives to give skin firmness and radiance. It also contains two types of vitamin C derivatives, one water-soluble and one oil-soluble, which are delivered slowly at different times to address pores and lack of firmness. Despite being an oil, you can experience its texture being absorbed into the skin."
If you like FAS lotion, you should definitely try this! I used a sample, and just like with the lotion, I felt a clearer complexion, tighter pores, and less redness. The oil also gave me even more firmness and radiance. With some skincare products, you can't tell what's so good about them after just one use, but I love this one because I can feel the effects even after just one use. I've tried using it both as a set with the lotion and separately, and I recommend using the set because it's more effective. Of course, I also felt the effects when using the individual products.