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Fermented soymilk is soy milk soured by the same lactic bacteria used for dairy yogurt, often with a little sugar added. It sits at the boundary of the atlas, as a yogurt analogue and the newest of the soyfoods. Beans are soaked and ground, the milk is boiled, sweetened, heat-treated, cooled and held at about 37 °C until it sets at about pH 4.5.
Fully documentedSoy and legumes28 h – 2.2 days
Recipe
Amounts from a sourceLaboratory recipe of Liu et al. (2025) for soy yogurt from 1 kg of soybeans.
A commercial direct-vat culture; one study added Weissella confusa as well[liu2025]
Starter
defined culture: dairy yogurt bacteria (L. bulgaricus and S. thermophilus), sometimes Lactobacillus acidophilus
Total time across the recorded steps: 28 h – 2.2 days
Start
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What changes:Soybeans soak in cold water overnight
Step 1 of 5
Soak the soybeans
Time
8–10 h
Reported
Temperature
Not documented
Salt
None given
Acidity
Not documented
Which microbes the steps name, step by step
Lactic acid bacteria
L. delbrueckii
S. thermophilus
Lactococcus lactis
Lactobacillus plantarum
Output: soaked beans.
Flavour
Not documented
Texture
Not documented
Colour
Not documented
Microbes at work in this step
Not documented for this step.
Method
Measured measured in a studySet fixed by a specification or tested recipeReported one source reports itTypical a general value, not sourced for this fermentUnconfirmed not yet checked against a source
At a glance
Fermented soymilk is soy milk soured by the same lactic bacteria used for dairy yogurt, often with a little sugar added. It sits at the boundary of the atlas, as a yogurt analogue and the newest of the soyfoods. Beans are soaked and ground, the milk is boiled, sweetened, heat-treated, cooled and held at about 37 °C until it sets at about pH 4.5. Made in 5 steps over 28 h – 2.2 days. The longest step, chill to finish, takes 12–24 h (Liu M 2025) and runs at 4 °C (Liu M 2025). Lactobacillus delbrueckii subsp. bulgaricus and Streptococcus thermophilus and Streptococcus thermophilus, Lactococcus lactis and Lactobacillus plantarum do most of the fermenting.
This is a boundary entry. It copies dairy yogurt, with dairy cultures and added sugar, instead of growing its own tradition like furu or tempeh. Unlike tofu, the soy milk is set by the acid that bacteria make, not by a coagulant.
Acidophilus soymilk (United States, 1930s)Soy milk fermented with Lactobacillus acidophilus; J.H. Kellogg used it therapeutically from 1933 and patented it in 1934 (Shurtleff and Aoyagi).
Soy kefir and soy cheeseOther dairy-style products from fermented soy milk; Shurtleff and Aoyagi give each its own history.
Safety
The soy milk is boiled and heat-treated before the culture goes in, and the yogurt is kept at 4 °C after it sets.
Shurtleff and Aoyagi call fermented soymilk the most recent traditional soyfood and the only one that began in the West. Li Yu-ying was granted British patents for lactic-fermented soymilk in 1910 and made it at his soy dairy near Paris.