Product & ordering
What is NAC?
NAC stands for N-acetyl L-cysteine, an acetylated form of the amino acid L-cysteine. It is the only active ingredient in our capsules.
What’s in each capsule?
Each vegetarian capsule contains 600 mg of N-acetyl L-cysteine (NAC). A daily serving is 2 capsules, which provides 1,200 mg. Full ingredients: N-acetyl L-cysteine (NAC), vegetable capsule (hydroxypropyl methylcellulose), microcrystalline cellulose, vegetable magnesium stearate, silicon dioxide. The full label is on our ingredients page.
How do I take it?
Take 2 capsules a day on an empty stomach, with water. Do not exceed the recommended daily intake.
Do I have to subscribe?
No, it's your choice. Buy once (sale prices: £30 for 1 bottle, £56 for 2 or £72 for 3) or subscribe and pay even less: £25 for 1 bottle a month, £46 for 2 bottles a month (£23 a bottle), or £57 for 3 bottles a month (£19 a bottle). Pause, skip or cancel any time from your account before your next order date.
Why does my bottle look different from the pictures?
We're rebranding. While we do, some orders will arrive in our older packaging rather than the design pictured on the website. The capsules inside are exactly the same. Using up our existing bottles keeps them out of landfill instead of throwing them away.
Can NAC treat or prevent a health condition?
We don’t make health or medical claims. There are currently no authorised health claims for NAC in Great Britain, so we only tell you what is in the product and how to take it. If you have questions about your health, please speak to your GP or pharmacist.
Who shouldn’t take it?
Speak to your doctor or pharmacist before taking any food supplement if you are pregnant, breastfeeding, taking medication or under medical supervision. Keep out of reach of young children.
Is it suitable for vegetarians?
Yes. They're vegetarian capsules with a vegetable-based shell (hydroxypropyl methylcellulose). We don't currently claim they're vegan.
Where do you deliver, and how long does it take?
We deliver to the UK with tracked delivery for £2.99, free on orders over £50, and to Australia, New Zealand, the USA and Canada. Estimated delivery is 9–14 days in the UK and 10–17 days for Australia, New Zealand, the USA and Canada. You can also add delivery protection for £5 in your bag. See Delivery & returns for details.
Can I return it?
Yes. Your first order comes with a 30-day money-back guarantee: if you’re not happy, email us within 30 days of delivery and we’ll refund the price you paid for the product, even if the bottle is opened. You don’t need to send it back. You can also cancel any order within 14 days of receiving it and return unopened products with the seal intact. Damaged or faulty items are always replaced or refunded.
How do I get in touch?
Email customerservice@crimsonpetallabs.com and we'll get back to you as soon as we can. Our details are on the contact page.
Ready when you are.
Up to 50% off sitewide. Subscribe from £19 a bottle, or buy once. Free UK delivery over £50.