Xiamen Jenny Chemical Technology Company in Xiamen City. Best to contact Olivia Wang. Number (also on WhatsApp) is +86 166 2100 6118. They also have TM5441, but the scientific evidence in favour of TM5614 is slightly more advanced. I would go for TM5614. Happy to join an order as well to get a better rate. You have to negotiate with them for a competitive price.