What Is the Green Stuff Inside a Lobster? (Tomalley Explained)

Tomalley is edible, and many people eat it regularly. However, food-safety authorities have occasionally advised limiting consumption because the hepatopancreas can accumulate environmental contaminants such as:

  • Heavy metals
  • PCBs (polychlorinated biphenyls)
  • Dioxins
  • Other pollutants present in seawater

The risk depends largely on where the lobster was harvested.

General guidance

  • Occasional consumption: Generally considered acceptable for most healthy adults.
  • Frequent or large amounts: Some health agencies recommend avoiding regular consumption of large quantities of tomalley.
  • Pregnant people, young children, and those with certain health conditions: It may be prudent to avoid tomalley unless local food-safety authorities say otherwise.

The lobster meat itself (tail, claws, and legs) is generally the part most commonly recommended for regular consumption.


How to Tell if a Lobster Has Gone Bad

Tomalley should not be confused with spoilage.

Discard the lobster if you notice:

  • A strong sour, ammonia-like, or rotten odor
  • Slimy or sticky meat
  • Gray, black, or discolored flesh (not the normal green tomalley)
  • Mushy texture throughout the meat
  • Shell damage accompanied by foul smell

Fresh cooked lobster should smell mildly sweet and ocean-like, not pungent or rotten.


How Tomalley Is Traditionally Used

In coastal cuisines, tomalley is often:

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