The one below. Look at the production date and batch number. Is there a three-digit number after the batch number? Fake goods generally don’t have it.

1. Small box identification method: 1. The genuine registered trademark "R" is temperature change anti-counterfeiting. Use a light If a lighter or match touches "R", "R" will disappear immediately, disconnect the fire source, and "R" will return to its original appearance. However, if the counterfeit product touches "R" with a lit lighter or match, the "R" will not disappear. 2. The product serial number on each small box of genuine products is arranged so that there are no repeated numbers in the product serial number of each batch.

2. How to identify the instruction manual: The authentic product is printed on anti-counterfeiting watermarked offset paper. Under light, the instruction manual shows the words "Wantong Pharmaceutical" watermarked in black and white.