1. Verify product identification and packaging: Kostin is a well-known brand, and its products will have unique identification and packaging. To distinguish the authenticity of Kostin, we can carefully check the product identification, trademark, packaging box and instructions. The real Kostin products will have clear and fine labels and packaging, while the counterfeit products will have misspelled or ambiguous trademarks or packaging.

2. Purchase channel and price: When purchasing Kostin products, you should choose officially authorized sales channels or reputable retailers. The products of formal channels undergo strict supply chain management to ensure the authenticity of products. Price is also a reference factor. There is a risk of counterfeiting when a merchant sells Kostin products at a price significantly lower than the market price.