Wen Jiang Medical Industries Sdn. Bhd. was founded in 1963, is one of the leading herbal medicine manufacturers in Malaysia. It has more than 50 years of pharmaceutical experiences since its establishment. With a mission to provide the best ever products for the consumers, the company moved into its new facility in 1987, complete with the most sophisticated packaging machines and other equipment to produce high quality beneficial herbal products. The company strictly adheres to GMP (Good Manufacturing Practices), HACCP (Hazard Analysis and Critical Control Point), ISO22000 (Food Safety Management Standard) and Halal certificates to ensure the high quality of all its products.

The founder Dato’ Foong Chow Hwey has over the years created a wide range of herbal products and has come up with the world’s first ever medicated teabag “Tan Ngan Lo Herbal Tea”. Tan Ngan Lo herbal tea is made of the finest natural traditional herbs and used for relief of flu, sore throat, quenches thirst. It has long been appreciated in tropical countries such as Singapore, Vietnam, Brunei and also exporting to non-tropical region like United Kingdom, United States, Australia, Canada, China, Macau, Hong Kong and among others.

With the development of era, Wen Jiang Medical has innovated the bottled herbal tea in 1987 followed by canned herbal tea in 1993. It’s more convenient for many people today. In addition, Tan Ngan Lo herbal tea is completely free of preservatives, artificial colorings and flavouring. It is generally seen as one of the healthy herbal tea products in the market. Through the never-ending innovations of the company, Wen Jiang Medical has developed a wide range of products which included Tan Ngan Lo Medicated Tea, Tan Ngan Lo Five Flower Tea, Tan Ngan Lo Oldenlandia Drink, Tan Ngan Lo Herbal Jelly, Tan Nyan Lo Chrysanthemum tea, Tan Ngan Lo Less Sugar Herbal Tea, and other medical products for external use such as Wen Jiang rheumatic oil, Tan Ngan Lo medicine oil and Mansoyko ointment.

In the year 2012, the first flagship Tan Ngan Lo outlet was opened at Sunway, KL. Since then, it has set up more than 25 stores in Malaysia. Today, Tan Ngan Lo has started his first store in Singapore, begun to explore overseas markets.

文强药厂有限公司成立于一九六三年，创立至今已拥有超过五十年制药经验，是马来西亚一家历史悠久的药厂。公司一直以来秉承着生产最佳品质的宗旨，于一九八七年迁入位于斯里并工业区的新制药厂，并引进了最新的全自动包装机械及其他制药机械进行生产及包装。文强药厂拥有GMP良好生产管制，HACCP危害分析和关键管制、ISO22000、及Halal清真等认证，在食品安全和品质上一直抱着谨慎的态度，务求确保产品的品质保持在最高水平。

创始人拿督冯兆辉先生多年来创造了多种功效卓越的草本植物产品；其中“单眼佬凉茶”是文强药厂在马来西亚首家创造的茶包式凉茶。它采用天然的原料，以代代相传的配方，对于解暑清热、外感发热、喉咙疼痛有着特别的功效，一直深受东南亚热带地域的爱戴，更远销至中国大陆、香港、澳门以及英美加澳大利亚等西方地域。

随着时代不断的发展及进步，文强药厂从最初的传统凉茶，改装成方便携带的茶包，再发展到一九八七年的瓶装、一九九三年的罐装凉茶，不仅为忙碌的城市人带来便利，也让他们能享有如家里一般的传统凉茶。为打造一个健康凉茶品牌，文强药厂旗下的食品及饮料皆不含防腐剂、调味剂及人造色素，坚守品质，售消费者喝得安心的凉茶。多年来，文强药厂不断地进行研发及创新，试图打造更多元化的产品，其中包括单眼佬五花茶、单眼佬百花蛇草水、单眼佬龟苓膏、单眼佬菊花茶、单眼佬低糖凉茶、跌打风湿油、单眼佬驱风油及万岁膏等。

二零一二年，文强药厂在马来西亚吉隆坡开设了第一间“单眼佬”连锁店。至今，旗下的连锁店在全国已扩展至25间。 二零一八年，文强药厂在新加坡开设了第一间跨国连锁店，已然开启国际市场的序章，迈向更远大的目标。