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Substances that can increase nitric oxide (choose incorrect answer):
Combining above with PDE-5 can be synergistic (choose correct answer):
True or false: Also PDE-5s plus L-arginine, citrulline and pentoxifylline can be combined with antioxidants such as Resveratrol or transresveratrol 500–1000 mg, leading to improvement in brain volume.
Dosages for (select correct answer):