Japan has developed one of the most sophisticated commercial probiotic and cultured dairy sectors in the world, driven partly by scientific research and partly by a food culture that places enormous importance on gut health and functional foods. When you visit Japan, the supermarket dairy aisle and the convenience store fridge are genuinely worth spending time in, because you’ll find products that don’t exist anywhere else.
Yakult and the Lactobacillus casei Shirota Story
Yakult was developed in 1935 by microbiologist Minoru Shirota, who spent years trying to identify bacterial strains that would survive the journey through the digestive system to reach the intestine alive. The result was Lactobacillus casei Shirota, a strain that is still used in Yakult products today and has been the subject of more published research than almost any other probiotic strain in the world.
In Japan, Yakult is sold in small bottles by delivery women who service regular customers on daily routes, a system that has operated since the 1960s. The product you buy at a Japanese supermarket is the same as what’s sold internationally, but there are also variations including a stronger concentration version (Yakult 400) and a full-fat variant that are only available in Japan. Try them alongside the standard version to notice the difference.
Meiji Bulgaria Yoghurt
Meiji Bulgaria yoghurt is a Japanese product made with the same bacterial strains as traditional Bulgarian kiselo mlyako, developed after Japanese researchers visited Bulgaria in the 1970s and brought back the cultures. It has a distinctive sharp, clean flavour and a firm texture, and it’s become one of the most popular yoghurt products in Japan.
The full-fat version is noticeably better than the low-fat variants and is worth seeking out. Meiji Bulgaria yoghurt is available at almost every Japanese supermarket and many convenience stores. It’s a good daily breakfast option when you’re travelling in Japan and want to keep your gut in good shape while adjusting to a different diet.
Calpis and Cultured Milk Drinks
Calpis (sold as Calpico outside Japan) is a non-carbonated soft drink made from lactic acid fermentation. It has a mild, sweet-tart flavour and a distinctive milky appearance. It’s widely available at convenience stores and vending machines throughout Japan and is worth trying as a representation of the Japanese approach to lactic-acid beverages.
Ramune is technically not a dairy product, but it’s a Japanese classic worth mentioning in the context of fermented drinks. The original version was lemon-flavoured and mildly sour from lactic acid fermentation. Modern versions are mostly just sweet carbonated drinks, but the original character of the drink came from its fermentation heritage.
Convenience Stores as a Source of Cultured Dairy
Japanese convenience stores (7-Eleven, FamilyMart, Lawson) have dairy sections that are significantly better than equivalent stores in most other countries. You’ll regularly find fresh yoghurt in single-serve portions, probiotic drinks in various formats, fermented milk beverages, and small yoghurt-based desserts. The quality is generally high and the range is excellent.
The convenience store is also where you’ll find drinks like Oronamin C (a vitamin and lactic acid drink), various Yakult variants, and seasonal flavours of probiotic beverages that aren’t available outside Japan. Spending a few minutes in the dairy section of a Japanese convenience store is a legitimate food experience for anyone interested in fermented and cultured dairy products.
