A naturopathic doctor, someone who focuses on natural therapies, may be more likely to suggest lysine than other doctors. [2] X Research source

Even if you have a diet high in lysine, taking a supplement is typically fine. Recommended dosing for lysine varies dramatically. Any amount between 500mg and 3000mg per day may be recommended by your doctor or naturopath. Any dose under 8 grams is not likely to be toxic, but always follow your doctor’s instructions. [4] X Research source

Additionally, high arginine foods can actually make cold sores worse, so they should be avoided in general if you have a herpes simplex infection.

Talk to your doctor before combining these 2 supplements. Consider limiting calcium-rich foods, such as milk, as well if you tend to eat a lot of them.

If you have cold sores caused by the herpes virus, talk to your doctor about whether lysine might help with your outbreaks. [8] X Research source There are other treatments for cold sores that have been well researched. If you have frequent outbreaks of cold sores, talk to your doctor about taking an antiviral medication that will prevent outbreaks.

Keep this uncertainty in mind when taking lysine, as it’s important to use caution when taking it and so that you manage your expectations about its effectiveness.

Chicken and turkey both contain about 4000mg of lysine in every 200 calorie serving. [10] X Research source

Fish is a particularly healthy choice when trying to add lysine to your diet. In addition to being high in lysine, fatty fishes like tuna are high in omega-3 fatty acids, which help brain and body function. [12] X Research source

The amount of lysine beans have varies based on the specific type of bean. However, most beans contain about 1000mg of lysine for a 200 calorie serving. [13] X Research source

Spirulina is a blue-green algae. An easy way to add it to your diet is to add put it in smoothies. It will turn your smoothie green but will not add a distinctive flavor to it. If you want to eat fenugreek, look for recipes that call for garam masala. Fenugreek is a key part of most garam masala spice blends. [14] X Research source