Why do people always say that Tianqidan is not good?

because the price is too low, the quality cannot be guaranteed. The price of Tianqidan is around 1 yuan. Tianqidan can't provide normal quality assurance because of its low price, especially the health care products have any problems, so it can't get timely and effective after-sales service, and at the same time it can't claim for the harm and influence caused to the human body.