The counts of starter cultures and L. casei during storage at 4oC for 21d ranged between 8.75 – 9.38 log cfu/g. Lee & Salminen (1995) reported the number of probiotics that >5 log cfu/g of the final product could be claimed to exert human health hence the probiotic yoghurt mixed with roselle syrups could be considered the health product. The yeast and mold counts of the yoghurts were < 100 cfu/g during storage time and were within the standard of The Ministry of Public Health (data not shown). The sensory evaluation showed that the scores of probiotic yoghurt mixed with 10% roselle syrup was significantly higher than that mixed with 5% (p