I bought the following supplements (in mind I have a rock hard erection and most in the list are as far as I know great for this purpose) Now if are here some experts and users with a large resource of knowledge regardsappropriate use of these supplements I kindly please for some advice. Im interested in proper daily dosage. This is the list ; L-Arginine a-Ketoglutarate AAKG 1.5kg Ginkgo Biloba Leaf P.E. 24/6 100g L-Citrulline DL-Malate 100g L-Tyrosine 250g Acetyl L-Carnitine (ALCAR) 100g Zinc Gluconate 500g L-Lysine HCL 500g L-Ornithine HCL 100g L-Phenylalanine 100g Betaine Anhydrous (TMG) 500g Red Wine Extract Powder 250g Grape Seed P.E. 95% 250g Pine Bark Extract 250g I can find many advise but there are mostly false net vendors information but for me my health is the most important. Regards !