|Anthony Williams 'Psychic to the stars' started the Celery Juice movement. The latter part of this description might put you off but Anthony Williams the Medical Medium gives a comprehensive break down of the components of celery and the reasons for it's healing benefits. There aren't any long term studies on taking celery juice in the way he prescribes but he does have thousands of anecdotal testimonials to it's benefits that seem to be legitimate, with plenty of before and after pictures of course.
The instructions for the celery juice protocol are very specific. You need to juice a whole head, with no additional ingredients, none, not even ginger :-( and drink it on an empty stomach. Then wait 30 minutes before having anything else. No guidance is provided on how long you need to do this cleanse for, but he does mention that some people start to see the benefits as soon as a week in. I tried it for 21 days.
The benefits are listed as clearer skin, improved digestion, less bloating, sustained energy, better mental clarity, weight loss, and stable moods, healing from all kinds of acute and chronic illnesses, including Hashimoto’s thyroiditis, eczema, psoriasis, acne, SIBO, constipation, chronic fatigue syndrome, blood sugar issues, migraines, acid reflux, high blood pressure, addictions, adrenal issues, gout, allergies, autoimmune conditions. So far, so good.