If you’ve ever cracked open an egg and spotted a thick, white, stringy bit clinging to the yolk, you’re not alone—and you’re definitely not wrong to wonder what it is. Many people mistake this strand for a flaw, a sign of spoilage, or even something they should remove before cooking.
But here’s the truth: that white strand is completely normal, perfectly safe, and actually a sign of freshness.
Its name? The chalaza (pronounced kuh-LAY-zuh).
What Does the Chalaza Do?
The chalaza is a natural, rope-like structure made of protein—specifically, the same proteins found in egg whites. Every egg contains two chalazae, one on each side of the yolk, though you’ll often only see one when you crack the shell.
Its job is simple but brilliant: to anchor the yolk in the center of the egg. Think of it as nature’s suspension system—keeping the yolk from bouncing against the shell during movement, which helps protect its integrity.
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