TAIYO Reduced Glutathione is the ONLY Japan made product. Please be reminded that the largest dosage in japan to use Glutathione reduced is only 200mg. There is no other reduced glutathione injectable in japan. Usage: Twice a week only No OVERDOSE See the real effect. Do not mislead with 500mg to 3000mg - reduced glutathione. Make sure seller has a company and not fly by night. Ask for a proof of certificate. Qty: One Vial