4 Pure Encapsulations L-Lysine Supplement Free From Common Allergens vs Natural Factors, L-Lysine 500 mg, 180 Vegetarian Capsules

We couldn't find enough data on either product to be able to come to any reliable conclusions. We highly recommend that you take a look at some other options in the $25 and $9 budget ranges instead.

The 4 Pure Encapsulations L-Lysine Supplement Free From Common Allergens hasn't managed to get enough recognition from sources that do high-quality hands-on testing and therefore didn't make it into any relevant roundups. That, by itself, makes it difficult to recommend.

Taking a look at the Natural Factors, L-Lysine 500 mg, 180 Vegetarian Capsules, we found that it hasn't managed to perform well enough to earn a spot in any L-lysine Supplement roundups done by sources that conduct their own, high-quality, hands-on testing. That alone makes it difficult to recommend.

As a last step, we wanted to do a head-to-head 4 Pure Encapsulations L-Lysine Supplement Free From Common Allergens vs. Natural Factors, L-Lysine 500 mg, 180 Vegetarian Capsules comparison of their review performance but, unfortunately, weren't able to find any review ratings on either product.