Source Naturals Resveratrol 200

A moderate-dose standardized extract providing 200 mg of resveratrol from Polygonum cuspidatum, plus complementary grape seed extract. Available in 30, 60, and 120 count bottles.

Why It Stands Out

The lowest cost per serving in this comparison. The added grape seed extract provides synergistic polyphenols. However, at 200 mg per capsule, you would need 2–3 capsules to approach the protocol's 500 mg dose, which changes the effective cost.