Guangming ranks third in terms of revenue among dairy enterprises in China, second only to Yili and Mengniu, and is one of the representatives of regional dairy enterprises. Bright Dairy has an advantage in low-temperature products, but its active lactic acid bacteria beverage has not been well promoted and has a low reputation.
 
In 2014, Guangming isolated the probiotic Lactobacillus plantarum ST-III. and added it to dairy products as one of the probiotic strains of Changyou series of yogurt and plant vitality.
 
Lactobacillus plantarum is widely found in fermented foods and has a long history of consumption. Lactobacillus plantarum ST-III. obtained two national invention patents and new resource food approval. Bright's claim that it has the functions of inhibiting the growth of pathogenic bacteria, enhancing the body's immunity, and lowering cholesterol levels lacks high-quality medical evidence.
 
Like most lactic acid bacteria drinks, the plant vitality is slightly brown, the taste is sour, the sweetness is not obvious, and each 100ml ingredient contains 1g of protein, no fat, and 14.4g of carbohydrates. Compared with Youyi C and Yiyitian, the activity of plant active lactic acid bacteria is poorer, but it also reaches the national standard value.
 
After 2014, Guangming also launched a light version of plant vitality and a new model of 100 billion yuan per day, but the market response was average, and it failed to achieve good sales, and it is currently impossible to buy on e-commerce platforms.