L-Lysine HCL for Everyday Immune & Skin Support

By far the most common reason in our reviews is cold sores, customers take it to support themselves, especially over winter or when run-down. Some also take it for general immune support. These are customers' own experiences, not health claims.

Reviewers commonly take it daily as a preventative routine, with some increasing at times they feel run-down. Follow the label directions; 1000mg is a high-strength single-tablet dose.

Customers do both, many take it regularly to keep on top of recurrent cold sores, while others take it at the first tingle. See what works for you.

L-Lysine is an essential amino acid, meaning the body can't make it and needs it from food or supplements. Alongside the cold-sore experiences customers describe, it's also involved in collagen formation for skin and tissue, and plays a structural role in bone health. Many reviewers build it into a daily routine.

There's no need to avoid specific foods, but if you take prescribed medication or have an existing health condition, check with your GP or pharmacist before starting, as with any new supplement. Stick to the recommended daily dose on the label rather than exceeding it.

Some customers pair it with immune-support nutrients. If you take prescribed medication, check with your pharmacist.

Please check the current product label for suitability and allergen information.

This varies from person to person, so there is no fixed timeline. Many people take L-Lysine daily as an ongoing habit rather than expecting an overnight result. If you tend to get recurring cold sores, a steady daily routine over several weeks is the usual approach. If outbreaks are frequent or severe, it is worth having a chat with your GP or pharmacist for tailored advice.

L-Lysine is generally well tolerated at the recommended dose. As with any supplement, taking more than advised isn't necessary and some people prefer to take it with food. If you're pregnant, breastfeeding, or on medication, check with your GP or pharmacist before use to be safe.

Some customers tell us they include L-Lysine as part of a wider routine during stressful or run-down periods, alongside rest and a balanced diet. This reflects individual customer experience rather than a health claim, so it shouldn't replace advice from your GP if stress is affecting you.

You can track your order using the link in your shipping confirmation email or by visiting your account page. UK standard delivery typically takes 2, 3 working days from dispatch. For international deliveries, please see our Shipping and Returns. If you need any further assistance, our Customer Care team is here to help at ask@justvitamins.co.uk.

UK standard delivery usually takes 2, 3 working days from dispatch (excluding weekends and bank holidays). For Next Day Delivery, please place your order by 1pm Monday, Friday for delivery on the next working day. You'll receive a tracking email as soon as your order has been dispatched, so we recommend checking your tracking information first if your order hasn't yet arrived.

If your order has not yet been dispatched, we'll do our best to help. Please contact our Customer Care team as soon as possible via email or live chat. Once an order has been dispatched, we're unfortunately unable to make changes or cancel it.

Yes. You can pause, skip, reschedule or cancel your subscription by logging into your account. Simply select Account at the top of the website and make any changes up to 3 days before your next scheduled dispatch.

We primarily serve customers in the UK, but we also deliver to selected international destinations. Please see our Shipping and Returns for the countries we currently ship to and applicable delivery charges.

We offer a 90-day hassle-free returns policy on unopened products. Return postage costs are the customer's responsibility unless the item is faulty or sent in error.

Our supplements are made in the UK in GMP-certified facilities to stringent quality standards. We carefully select our ingredients and carry out rigorous quality checks throughout the manufacturing process, so every product meets our high standards.

Every order is covered by our 90-day money-back guarantee. If you are not completely happy for any reason, contact our Customer Care team within 90 days of purchase and we will refund you, no awkward questions. It is our way of making it easy to try something new with confidence.