It grades moderate, which puts it well below the aged cheeses we grade very high, but clearly above a fresh unaged cheese. The mechanism is proteolysis: as the cheese cures, enzymes break protein into free amino acids and bacteria convert histidine into histamine. That means the answer depends on the tier. A semicurado of two or three months carries less than a viejo aged past a year, and the same wheel gets higher the longer it sits.

Only a little, and it grades low in our data. Two things strip it out. Pressing forces whey from the curd and the lactose leaves dissolved in that whey, then the starter cultures ferment most of what stayed behind into lactic acid during ageing. The longer the cure, the less remains, so a curado or viejo carries less than a semicurado. Low is not zero, but lactose is rarely the reason manchego causes trouble.

Treat it with caution and treat the aged tiers with more. Manchego grades moderate for tyramine, formed when ageing bacteria decarboxylate tyrosine, and that content climbs steadily with cure time. Standard MAOI guidance is to avoid aged and matured cheese, and a curado or viejo manchego falls squarely in that category. A young semicurado sits at the safer end of the same food, but it is still a cured cheese.

Usually not. Manchego carrying the DOP mark is traditionally coagulated with animal rennet from a lamb stomach, which rules it out for most vegetarians even though the cheese contains nothing else of animal origin beyond the sheep milk. Some producers now use microbial coagulant, but it is not the default and it is not guaranteed by the DOP, so the label is the only reliable check. Acid-set cheeses like paneer avoid the issue entirely.