Two Korean health outlets ran pieces this year on the belief that sagol-guk (사골국, the long-simmered beef bone soup) is good for your bones. Hidoc (Jan 28) says a 400 ml bowl has 14 mg of calcium and calls that 1/14 of one carton of milk, which it puts at 200 mg. Segye Ilbo (Mar 9) says a cup of about 240 ml has 10 to 15 mg, 1 to 2 percent of a day’s need, under a headline that says you’d need 50 bowls.
The 1/14 line is the part I’d be careful with. Another outlet that repeated the figures, Ardent News, names the carton as 200 ml. So the bowl is 400 ml and the milk is 200 ml. Per 100 ml that is 3.5 mg against 100 mg, which is closer to 1/29 (my arithmetic). The conclusion survives, the headline ratio doesn’t.
The oldest number I found is from a 2013 Rural Development Administration press release (농촌진흥청): calcium at 21.15 mg per liter of the second-extraction broth, listed in its Table 4 next to potassium and sodium. That works out to about 5 mg in a 250 ml bowl (my arithmetic). The release’s text only says the soup contains calcium, magnesium, potassium, sodium and iron “고루” (evenly/all present), and it never compares calcium with milk. Its one milk comparison is calories: about 47 kcal per 100 ml, “저지방우유 수준” (low-fat milk level).
So the three sources give roughly 2 to 6 mg per 100 ml, about a threefold spread, and none says exactly which broth was measured. Against the 2025 Korean dietary reference intakes (650 mg a day for women 19 to 49, 800 mg for men), a bowl is somewhere between under 1 and about 2 percent.
The same RDA release has a warning I hadn’t seen repeated anywhere: its researcher said brewing the bones too many times raises phosphorus, which can interfere with calcium absorption, so about three brews is the recommendation, and after four or more the calcium drops sharply.
Where the belief does hold up is calories. A later RDA release (2018) puts the soup at 47 kcal per 100 ml against 61 for milk.
What I couldn’t get: the government nutrient database (K-FIND) loaded as a search form when I opened it on Oct 5, so I have no sagol entry from it, and a boxed or restaurant broth can differ from all three figures. For a packaged one, the calcium line on the label times your bowl is the number that applies.
Sources (Korean):
– Hidoc, Jan 28: https://news.hidoc.co.kr/news/articleView.html?idxno=58292
– Segye Ilbo, Mar 9: https://v.daum.net/v/20260309154727623
– RDA press release, Feb 2013: https://nias.go.kr/front/prboardView.do?cmCode=M090814150850297&boardSeqNum=2517&columnName=&searchStr=&currPage=164
I put the full table, the 2025 intake figures and the calorie comparison in a longer post on my own blog: https://koreantable1.blogspot.com/2026/10/does-korean-sagol-bone-broth-have.html
(English isn’t my first language, so some parts were translated with help.)
submitted by /u/EnsoMighty
[link] [comments]
