Sea cucumber: a dried protein food with one tiny trial behind it

The only human trial of sea cucumber is very small. In a Japanese nursing home, 8 residents aged 72 to 102 ate a 12 g jelly that was 25 percent sea cucumber by weight after every meal for 1 week, and Candida on the tongue and cheek fell significantly compared with their own starting counts, while 9 residents ate a jelly without sea cucumber. The analysis compared each group with itself and never tested the two groups against each other, so a week of jelly in 17 people does not show that sea cucumber clears oral thrush. What sea cucumber really is, as food, is a protein that depends on drying. Fresh animals hold only 3.4 to 8.7 percent protein, while dried sea cucumber reaches 37 to 72 percent, a wide range because the review pooled many species and methods. Every essential amino acid is present, with lysine the one below reference, going by chemical scores rather than digestion measured in people.

The numbers, per 3.5 oz (100 g)

How much is actually in it

• Fresh sea cucumber holds only 3.4-8.7% protein, while the dried product reaches 37-72%. — Published composition analyses of food sea cucumber species (n = -) Evidence C source
  Protein 3.4-8.7% fresh vs 37-72% dried
• USDA lists Alaska Native sea cucumber (yane) at 13 g protein and 0.94 mg riboflavin per 3.5 oz (100 g), from a single record with no sample spread. — US reference food record (n = 1 record) Evidence E source
  Per 100 g: protein 13 g; riboflavin 0.94 mg; niacin 3.2 mg

What your body absorbs

• Sea cucumber protein contains all essential amino acids, with chemical scores above reference except lysine. — Published amino acid analyses, mainly Holothuria tubulosa (n = -) Evidence C source
  All EAA present; lysine below reference

What cooking and storage change

• In a laboratory processing study, 54 h of soaking removed about 98% of arsenic and 94% of lead from sea cucumber body wall, leaving both below 0.5 mg/kg. — Apostichopus leucoprocta body wall, laboratory processing (n = -) Evidence D source
  As removed 98.22 +/- 0.91%; Pb removed 94.11 +/- 1.08%; both below 0.5 mg/kg
• Dried, gutted and boiled sea cucumber is the safer form microbially, while the growing habit of eating it raw as sashimi raises food safety challenges. — Review of microbial hazard studies in sea cucumber (n = -) Evidence C source
  Boiled dried product safer; raw ready-to-eat consumption raises food safety challenges

What it does to your health

• The trial dose was a 12 g jelly containing 25% sea cucumber by weight after every meal, and Candida on the tongue and cheek fell significantly after 1 week. — 8 elderly nursing home residents (72-102 years) vs 9 controls (n = 17) Evidence B source
  Candida decreased on tongue (p = 0.012) and buccal mucosa (p = 0.021) after 1 week

Safety, limits and interactions

• In Atlantic sea cucumber (Cucumaria frondosa) about 70% of arsenic was inorganic, and staying under 18 micrograms of inorganic arsenic a day would cap dried product at about 29 g daily for a 132 lb (60 kg) adult. — Cucumaria frondosa from Nova Scotia and Newfoundland and Labrador, Canada (n = -) Evidence C source
  IAs about 70% of total recovered As; max about 29 g/day processed body wall (beche-de-mer) and 11-13 g/day body wall at 0.3 ug/kg bw iAs
• A review of 41 studies found microplastics in sea cucumbers, mostly fibers (33%) and fragments (27%). — 41 peer-reviewed studies of microplastics in sea cucumbers (n = 41 studies) Evidence C source
  Fibers 33%, fragments 27%, films 14%; PE 25%, PP 17%

Who this works differently for

• In a double-blind trial in a nursing home, sea cucumber jelly eaten for one week showed inhibitory effects on oral Candida in 8 elderly residents, while 9 others ate a control jelly without sea cucumber. — 17 elderly nursing home residents with oral Candida, Japan, 1 week (n = 17) Evidence B source
  Inhibitory effect on oral Candida in the sea cucumber group, from before-after counts; no between-group test

What is still unknown

• Import alert portals reported no food safety issues for sea cucumber or products containing it over the past 7 years. — Literature search to March 2022 and FAO import notification data (n = -) Evidence C source
  No reported food safety issues in 7 years

The bottom line

The single USDA record, for the Alaska Native preparation called yane, lists 13 g of protein and 0.94 mg of riboflavin per 3.5 oz (100 g), with no sample spread. There is no US survey portion for sea cucumber. Arsenic is the real limit. In Atlantic sea cucumber from Nova Scotia and Newfoundland, about 70 percent of the arsenic recovered was the inorganic kind, and holding an adult of 132 lb (60 kg) under 18 micrograms of inorganic arsenic a day would cap the dried product at about 29 g daily and unprocessed body wall at 11 to 13 g. The limit is set per kilogram of body weight, so it is lower for a lighter person. The speciation method recovered only about 30 percent of the total, and the authors think few people eat that much. Soaking helps in industry. A lab process ending in 54 hours of soaking removed about 98 percent of the arsenic and 94 percent of the lead, which is factory processing that home cooking does not reproduce. Dried, gutted and boiled sea cucumber is the safer form for germs. Eating it raw as sashimi raises food safety problems, a view based on only five microbial studies and no outbreak traced to sea cucumber. A review of 41 studies found microplastics in the animals, mostly fibers (33 percent) and fragments (27 percent), measured in the animal and partly in the gut, which is usually removed, so how much reaches a person is not known. We found no card on sea cucumber in pregnancy, in children, with medicines or as an allergen. Import alert portals checked by a 2022 review logged no sea cucumber food safety problems over 7 years. That is an absence of data, which is a weaker thing than evidence of safety.

Sources

1. scuc-daily-r6-03 · systematic review
   The protein content of fresh sea cucumbers is quite low and vary between 3.4–8.7%, whereas dried sea cucumbers contain between 37–72% protein.
   Foods (Basel), 2022: Food safety risks posed by heavy metals and POPs related to consumption of sea cucumbers · checked 2026-09-29
2. scuc-daily-r6-10 · dataset
   Sea cucumber, yane (Alaska Native) | FDC 167618 | per 100 g: protein 13 g, riboflavin 0.94 mg, niacin 3.2 mg
   USDA FoodData Central, SR Legacy 2018, Sea cucumber, yane (Alaska Native) (FDC 167618) · checked 2026-09-29
3. scuc-daily-r6-04 · systematic review
   Although the protein content of fresh sea cucumbers is low, the protein quality is high, and all EAA are found in sea cucumbers. ... The chemical scores were higher than reference amino acids, except for lysine [45].
   Foods (Basel), 2022: Food safety risks posed by heavy metals and POPs related to consumption of sea cucumbers · checked 2026-09-29
4. scuc-daily-r6-06 · laboratory study
   After soaking for 54 h 98.22 ± 0.91% of As and 94.11 ± 1.08% of Pb were removed and were below 0.5 mg/kg in all samples [34].
   Foods (Basel), 2022: Food safety risks posed by heavy metals and POPs related to consumption of sea cucumbers · checked 2026-09-29
5. scuc-daily-r6-07 · systematic review
   So far, we have discussed the consumption of “bêche-de-mer”, dried body wall, gutted and boiled, the most prevalent food product, and as it is highly processed and boiled, it is safer from the microbial safety perspective. ... In order to pursue the original flavour, people increasingly prefer to eat raw ready-to-eat sea cucumbers, in sashimi and sushi, which inevitably causes food safety challenges [107].
   Foods (Basel), 2022: Food safety risks posed by heavy metals and POPs related to consumption of sea cucumbers · checked 2026-09-29
6. scuc-daily-r6-02 · randomized controlled trial
   Twelve grams of jelly containing 25% (w/w) S. japonicus were provided for the test group after every meal as a dessert. ... By contrast, Candida on the tongue and buccal mucosa were significantly decreased after 1 week of eating S. japonicus jelly (tongue, p = 0.01221; and buccal, p = 0.02087; Figure 4c).
   Mar Drugs, 2013 · checked 2026-09-29
7. scuc-daily-r6-05 · systematic review
   On the contrary, inorganic iAs represented around 70% of the total recovered As in the body parts of Cucumaria frondosa harvested in Nova Scotia (NS) or Newfoundland and Labrador (NL). Using a maximum daily dietary iAs intake of 0.3 μg/kg body weight; for a body weight of a 60 kg adult, a maximum of 18 μg iAs/day would limit the intake of the most prevalent food product of sea cucumber “bêche-de-mer” or processed body wall of Cucumaria frondosa to 29 g, and body wall to 11 (NL) g and 13 (NS) g [42].
   Foods (Basel), 2022: Food safety risks posed by heavy metals and POPs related to consumption of sea cucumbers · checked 2026-09-29
8. scuc-daily-r6-09 · systematic review
   The distribution, abundance, morphological characteristics, and polymer composition of MPs in sea cucumbers are all extensively assessed in this review, which is based on a systematic review of 41 peer-reviewed studies evaluating patterns in MP contamination. Fibers (33%), fragments (27%), and films (14%) make up most of the MP particles found in these types of organisms.
   Environ Geochem Health, 2026 · checked 2026-09-29
9. scuc-daily-r6-01 · randomized controlled trial
   Eight individuals in the nursing home took the sea cucumber jelly for a week and their oral Candida were counted before and after the intervention. Nine individuals took a control jelly without S. japonicus. The sea cucumber jelly showed inhibitory effects on the oral Candida.
   Mar Drugs, 2013 · checked 2026-09-29
10. scuc-daily-r6-08 · systematic review
    No food safety issues were reported in these portals for sea cucumber or products containing sea cucumber over the past 7 years.
    Foods (Basel), 2022: Food safety risks posed by heavy metals and POPs related to consumption of sea cucumbers · checked 2026-09-29