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N-Acetyl-L-Cysteine (NAC) is derived from L-cysteine‚ an amino acid which is a precursor to glutathione‚ an important antioxidant. Only a limited amount of glutathione is naturally present in the human body; therefore‚ it must be synthesized from cysteine.
NAC is the primary antioxidant produced by your body‚ and is involved in a number of crucial metabolic processes. It also plays an important role in protein synthesis‚ the activation of enzymes‚ and the synthesis and repair of your DNA. NAC is also a source of sulfur; sulfur metabolism is a key biological process in all living organisms‚ because it acts as a constituent of molecules like methionine‚ cysteine‚ and coenzyme-A‚ all of which are crucial in energy generation and enzymatic processes.
L-cysteine is relatively unstable‚ and often it is degraded during the process of absorption to the point where your body is not able to use it. NAC‚ however‚ is more stable‚ which is why it’s well-suited to supplements. After absorption‚ NAC is converted into L-cysteine‚ which increases cysteine levels throughout the body. Each tablet of Allergy Research Group’s NAC N-Acetyl-L-Cysteine contains this free-form amino acid in order to provide you with many health benefits.
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.