Where the limit falls
This is purely a matter of quantity, and the gap between the two forms is wide enough to spell out approximately: tabbouleh contains a relatively large amount of parsley compared with other dishes, but it is spread across a whole meal with bulgur, tomato, and lemon, and is usually eaten once or twice a week. Parsley juice, by contrast, typically packs a whole bunch or more into a single glass drunk at once — and may be repeated daily. The difference between the two is not a matter of degree but of a different kind of use.
About the "bringing down a pregnancy" myth — a section about your safety
One of the most circulated claims about parsley is that it brings on a late period or ends an early pregnancy, and recipes for infusions or topical use are passed around. We say this plainly because it concerns your safety: this is not an effective method, and it is not a safe one. Nothing supports parsley's ability to reliably end a pregnancy, and the amounts that might affect the uterus are large enough to cause real harm at the same time — to the kidneys, the liver, and blood clotting. Topical use in particular has documented cases of severe infection, bleeding, and sepsis, some ending in serious complications.
And if you are looking into this because you are in a difficult situation — an unplanned pregnancy, or circumstances where you have no one to ask — you deserve real information, not a circulated recipe. Speak to a doctor, a pharmacist, or any trusted healthcare source in your country about the options legally and medically available to you. Whatever your decision, you have a right to it being made under safe supervision, rather than trying something at home that could harm you before anything else.
Myth Parsley brings on a late period, so if yours is late, drink a strong infusion before taking a pregnancy test.
Fact There is no evidence that parsley regulates or brings on a period. More importantly, doing this delays the one genuinely useful thing: finding out why. A late period has many causes besides pregnancy — stress, weight change, a thyroid disorder, polycystic ovaries, or a change in sleep patterns and travel — and some need real treatment that no drink will provide. The logical first step is a home pregnancy test, which is cheap, accurate, and fast, followed by a doctor's visit if it is negative and the delay continues. Drinking large amounts of any herb hoping to "bring down a period" carries potential harm against a benefit that does not exist.
When to ask your doctor
Ask your doctor if you drink parsley juice regularly, if you take blood thinners — parsley is rich in vitamin K, which interacts with them — and if you have kidney disease. Seek urgent care if you have taken a very large amount of parsley in any form and feel pain, bleeding, severe nausea, or a change in urine colour. Seek urgent care too if you have bleeding or abdominal pain during pregnancy, whatever the cause. And do not hesitate to ask your doctor about anything you have read or heard — the question is not embarrassing, and silence is what lets circulated recipes spread.