Now Foods L-Arginine (500mg) - 250 ct (Pack of 2) vs (New Improved Formula) Best Naturals L-Arginine 1000 mg 120 Tablets - Pharmaceutical Grade L Arginine Supplement Promotes Nitric Oxide Synthesis

We couldn't find enough data on either option to be able to come to any reliable conclusions. We strongly suggest that you look at some alternatives that also cost around $8.

The Now Foods L-Arginine (500mg) - 250 ct (Pack of 2) hasn't managed to perform well enough to earn a place in any L-arginine Supplement roundups conducted by sources that do their own, high-quality, hands-on testing. That alone makes it a hard product to recommend.

As for the (New Improved Formula) Best Naturals L-Arginine 1000 mg 120 Tablets - Pharmaceutical Grade L Arginine Supplement Promotes Nitric Oxide Synthesis - it wasn't considered to be a good enough purchase to earn a spot in any roundups conducted by sources that perform objective hands-on testing, which typically indicates that a product isn't worth its asking price.

As a last step, we wanted to do a head-to-head Now Foods L-Arginine (500mg) - 250 ct (Pack of 2) vs. (New Improved Formula) Best Naturals L-Arginine 1000 mg 120 Tablets - Pharmaceutical Grade L Arginine Supplement Promotes Nitric Oxide Synthesis comparison of their review performance but, unfortunately, weren't able to find any review ratings on either product.