Cystine not reported for eggs?

For the day, my Cystine shows 37% despite consuming two large eggs.

According to, eggs are one of the top sources for Cystine with a single large egg containing 51% of the RDI for Cystine.

What am I misunderstanding?


  • I see the problem. The item doesn't have most of the micronutrients specified. Is there a way to get this information and update the item?

  • Hello @t4sm5la4r ,

    We report the same cystine values for eggs. For ''Eggs, Cooked'', 1 large egg contains 0.146 grams of cysteine. is using different targets from Cronometer to calculate their DRI%. The DRI that they are referring to are the WHO guidelines, which recommends 4.1 mg/kg of body weight. They are also calculating the DRI for someone weighing 70kg.;jsessionid=79168E386DEF39F918D6D5925FB4A3A8?sequence=1

    In Cronometer, we use the amino acid recommendations from the National Academy of Science:

    Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids. Chapter 10: Protein and Amino Acids. The National Academy of Science, Institute of Medicine, Food and Nutrition Board in the US in 2005.

    Based on the values given in table 10-22 (page 677), where there is more than one EAR given, the values were averaged and rounded to the nearest whole number. The RDA for amino acids is 124% of the EAR, rounded to the nearest whole number.

    For cysteine, this would mean that our target is 9.5 mg/kg of body weight. It is higher than the target determined by WHO, which would explain why 1 large egg does not correspond to the same DRI % determined by

    The Cysteine target in Cronometer will also be adapted to your exact weight.

    Please let me know if you have more questions!


    As always, any and all postings here are covered by our T&Cs:

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