N-acetyl Cysteine (NAC) is the more stable form of the amino acid L-Cysteine due to the additional acetyl molecule attached. L-Cysteine can directly participate in glutathione synthesis, whereas N-acetyl-L-cysteine must be first de-acetylated (i.e., broken down) before its incorporation to glutathione. Cell studies have shown L-Cysteine to be more effective in increasing cellular antioxidant glutathione levels. However, L-Cysteine is less stable than NAC so oxidizes more readily in the body. To help prevent or slow this process, 3x more ascorbic acid (vitamin C) should be consumed. So for every 1g L-Cysteine consider taking 3 g Vitamin C.

I read an article about a new study saying this will cure hangovers. Thoughts?

I read that article and bought a bottle to try. It works! Absolutely amazing hangover cure that actually works. I get hangovers from just 2 glasses of beer normally and now I get virtually none. I just take 2 tablets each time I drink and may take another if I go hard. If I drink too much and forget to take a 3rd tablet, I may have a very mild headache the next day, which is much improved from being out for the count all day like I used be after drinking. My boyfriend and roommate can also attest and ask me for some whenever we have some drinks together. All I can say is, just try it. You'll be amazed.

Is it made of human hair? If surprised read about L cysteine or E920(another name) on internet

Apparently synthetic L-Cysteine is expensive to manufacture, so human hair, duck feathers and pigs' bristles can be used. Whether NOW's L-Cysteine is a product of human hair it is not clear.

Is this product vegan?

It is most commonly derived from human hair.

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Supplements, L-Cysteine 500 mg with Vitamins B-6 and C, Structural Support*, 100 Tablets

Product ID: 2576147

Details

Brand
NOW Foods
Diet Type
Kosher
Flavor
Unflavored
Item Form
Tablet
Item Weight
6.4 ounces
Item dimensions L x W x H
2.5 x 2.5 x

✅Non-GMO, Soy-Free, Gluten-Free Certified

💊500 mg L-Cysteine per tablet

🧬Supports collagen & keratin synthesis

Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

¥3277

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

Description

✨ Elevate your glow game with NOW Foods L-Cysteine – where science meets beauty! 💫

GMP QUALITY ASSURED - Trust in premium quality backed by rigorous third-party testing and ISO/IEC accredited labs.
VITAMINS B 6 C SYNERGY - Boost collagen formation and skin vitality with essential co-factors for radiant hair, skin, and nails.
CLEAN CERTIFIED FORMULA - Enjoy peace of mind with Non-GMO, Soy-Free, Gluten-Free, Halal, and Kosher certifications.
POWER PACKED 500 MG L CYSTEINE - Fuel your metabolism and antioxidant defenses with a potent dose of this sulfur amino acid.
100 TABLETS FOR LASTING WELLNESS - A convenient month-plus supply designed to seamlessly fit your daily health routine.

NOW Foods L-Cysteine 500 mg tablets combine a powerful sulfur amino acid with vitamins B-6 and C to support collagen production, keratin stability, and antioxidant metabolism. This non-GMO, allergen-free formula is crafted under GMP-certified conditions, ensuring premium quality for healthy skin, hair, and nails. With 100 tablets per bottle, it’s a smart, clean supplement designed for professionals who demand effective, trustworthy wellness solutions.

Specifications

ASIN	B000QVEI1A
ASIN	B000QVEI1A
Age Range Description	Adult
Allergen Information	Allergen-Free
Best Sellers Rank	#54,579 in Health & Household ( See Top 100 in Health & Household ) #2,031 in Blended Vitamin & Mineral Supplements #2,919 in Sales & Deals #4,421 in Diet & Sports Nutrition
Brand Name	NOW Foods
Color	Off White
Container Type	Bottle
Customer Reviews	4.5 4.5 out of 5 stars (3,938)
Date First Available	March 2, 2004
Department	Health and Beauty>Health and Wellness
Diet Type	Kosher
Dosage Form	Capsules,Tablet,Tablets
Flavor	Unflavored
Global Trade Identification Number	00733739000774
Is Discontinued By Manufacturer	No
Item Dimensions	2.5 x 2.5 x 4.44 inches
Item Form	Tablet
Item Weight	6.4 ounces
Item model number	0077
Manufacturer	NOW Sports - Nutrition and Wellness
Manufacturer	NOW Sports - Nutrition and Wellness
Manufacturer Part Number	0077
Material Features	Vegan
Model Name	hfs-koi-zk-a665
Model Number	0077
Number of Items	1
Primary Supplement Type	Vitamin B6, Vitamin C
Product Benefits	Metabolism Improvement,Hair, Skin, Nail & Joint Support,Dietary Supplement
Product Dimensions	2.5 x 2.5 x 4.44 inches; 6.4 ounces
Special Ingredients	Amino Acid, Collagen
Specific Uses For Product	Amino Acid
Total Servings Per Container	100
UPC	733739000774
Unit Count	100 Count

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Reema J.

Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

Fatima A.

Best international shipping I've ever tried. Worth every penny!

3 days ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.