It's good to be skeptical about wonder drugs, because often there's nothing wonderful about them at all. So when a finance worker friend of mine told me he'd discovered a miracle treatment that gives him a huge advantage over his colleagues, I was dubious. "No—I'm full of energy every day and feel like a new person!" he promised. "I don't need to drink eight cups of coffee every day now; this is so much better, and I just get a top up every few weeks!"

It still sounded like bullshit, but the only way I could tell for certain was to put it to the test. I'd quit drinking that particular week, and—as I'd learned online—this treatment could apparently help to mitigate my booze cravings, so the timing was perfect: I booked an appointment for the following day.

The internet tells me NAD+ is popular among the "anti-aging community," thanks to a Harvard Medical School study that found it rewound "aspects of age-related demise in mice." It's also supposedly good for: detoxing from alcohol and drugs, increasing energy and focus, reducing chronic fatigue, increasing your metabolism, and improving your cardiovascular health.

The main ingredient in the intravenous cocktail is nicotinamide adenine dinucleotide, or "NAD+." Discovered in 1906, it's a coenzyme found in all living cells that is "essentially responsible for converting food energy into cellular energy," according to Dr. Mark Collins, consultant psychiatrist at the Priory Hospital, Roehampton.

I suspected he may have just found out about Modafinil, or one of the other study drugs internet psychonauts have already been using for years. But I was wrong. He sent me a link to a pharmacy in South Kensington offering intravenous "Brain Reboot Infusions," which of course sound far too much like something from Minority Report to be genuinely real. But I decided to give my friend the benefit of the doubt and do a little research anyway.

Fifty minutes in, I felt a calm sense of positivity envelope my body. Yassine came in and said I had ten minutes left, which flew by. Removing the IV, he asked me how I felt.

Yassine inserted the drip and, a moment later, the "Brain Reboot Cocktail" was flowing through my veins. As he'd warned, I began to feel my chest tighten. Thirty minutes in, I started to wonder what I was doing—my head was aching, the discomfort was becoming kind of alarming, and I was suddenly acutely aware that a foreign substance had by now probably completely flooded my bloodstream. I toyed with the idea of hitting the buzzer Yassine had provided me with should I want to end the treatment, but I decided to stay the course.

I signed some waivers and was escorted to a room where Yassine took my blood pressure. Which, you'll be happy to hear, was normal.

"You will feel your chest tighten and may get a headache," he said. "But this will pass."

I arrived a little early, but a Dr. Yassine was there to meet me and explain some of the side effects I might experience while receiving the treatment.

Zen Healthcare, just around the corner from Harrods, specializes in the kind of things you might expect a Knightsbridge clinic to specialize in: "bespoke weight loss therapies," travel vaccinations for far-flung locations, botox, "vampire facials," and, of course, Brain Reboot Infusions—which will set you back about $600. (Full disclosure: I got mine for free.)

"Kinda dreamy," I said.

"A lot of people say similar. Be careful on your way home."

I thanked Yassine more than I needed to. It was time for me to go.

I walked outside, and it hit me: I felt a surge of energy, but no jitters or edginess. My mood had noticeably improved. I felt poised, positive, and pumped-up. I remember thinking, This is awesome, and then saying exactly that out loud. I hopped on the subway, which was as crowded as ever, but for once all the back sweat and the fact it was nearly getting in my mouth didn't bum me out at all.

I woke up the next day at 7 AM and didn't feel horrendous, which is unusual for me. In fact, I felt great. The dreamy feeling had gone, but there was a definite improvement in energy levels, focus, and mindset. This continued throughout the rest of the day, and then for the following eight or so days. But what of its supposed effects on my otherwise unwavering love for beer?

"It's been known for decades that a high dose of vitamin B3—the 'poor man's' way of elevating NAD levels—has a beneficial effect for alcoholics, both in terms of detoxification and, perhaps more importantly, in reducing craving and anxiety levels after detoxification," said Dr. Mark Collins in an email.

And it seems the theory still holds: In all the time I could feel the treatment's effects, I didn't crave the cold embrace of a freshly poured pint even once.