Kim Kardashian Energy Drink: A Dietitian’s Honest Review

Kim Kardashian just launched an energy drink—and it’s not what you’d expect. Called Update, this Kim Kardashian energy drink skips caffeine entirely and relies instead on a compound called paraxanthine. The promise? Smooth, steady energy without the jitters, crashes, or sleep disruption. But does the science support the hype, and is this Kim Kardashian energy drink actually good for you? Here’s what a dietitian wants you to know before you crack open a can.

What Exactly Is the Kim Kardashian Energy Drink?

Update is a new energy drink launched by Kim Kardashian that claims zero sugar, zero calories, and zero artificial flavors or colors. The headline ingredient is paraxanthine—a compound your body naturally produces when it metabolizes caffeine. Instead of drinking caffeine and waiting for your liver to break it down, Update delivers the main active metabolite directly.

The drink also contains several supporting ingredients: L-theanine (an amino acid found in tea leaves known for calm focus), alpha-GPC (a choline compound linked to cognitive performance), and methylcobalamin (a bioavailable form of vitamin B12). It’s caffeine-free in the traditional sense, though paraxanthine acts on many of the same brain pathways as caffeine.

The marketing positions this Kim Kardashian energy drink as a smarter, gentler alternative to traditional energy drinks—no jitters, no crashes, no sleep disruption. That’s a bold claim. Let’s see what the research actually says.

Paraxanthine vs. Caffeine: What the Science Says

When you drink coffee or any caffeinated beverage, your liver breaks down the caffeine into three metabolites: paraxanthine (about 78%), theobromine (about 14%), and theophylline (about 8%). Paraxanthine is responsible for most of caffeine’s alertness and focus benefits. Theobromine and theophylline, on the other hand, are associated with many of the uncomfortable side effects—anxiety, rapid heartbeat, nausea, and digestive distress.

The idea behind paraxanthine supplements is straightforward: deliver the beneficial metabolite while skipping the ones that cause problems. And early research supports this concept. A 2024 double-blind study published in the Journal of the International Society of Sports Nutrition found that paraxanthine provided greater improvement in cognitive function than caffeine after a 10-kilometer run. Participants who took paraxanthine showed increased correct responses and fewer decision-making errors, while caffeine increased perceptions of rapid heartbeat, shortness of breath, and nervousness.

There’s another fascinating advantage: paraxanthine works more consistently across different people. Caffeine sensitivity varies dramatically based on genetics—specifically the CYP1A2 enzyme that determines how quickly your body metabolizes it. Slow metabolizers experience more jitters and sleep disruption, while fast metabolizers barely feel a single cup of coffee. Because paraxanthine bypasses this metabolic step, its effects are more predictable regardless of your genetic makeup.

Paraxanthine also has a roughly 25% shorter half-life than caffeine. This means it clears your system faster, reducing the likelihood of sleep disruption if consumed later in the day. For women struggling with sleep quality and weight management, this is a potentially meaningful difference.

The Ingredients in Kim Kardashian’s Energy Drink: A Dietitian’s Breakdown

The paraxanthine in Update is the headline story, but a closer look at the full ingredient list reveals a more nuanced picture. Not everything in this Kim Kardashian energy drink is equally impressive.

L-Theanine is an amino acid naturally found in green tea that promotes relaxation without drowsiness. When combined with stimulants, it creates a “relaxed alertness” that many people find more productive than caffeine alone. There is evidence that L-theanine can improve attention and reduce anxiety. However, the dose matters significantly—and when quantities aren’t listed on a label, there’s no guarantee the amount is effective.

Alpha-GPC is a choline compound involved in producing acetylcholine, a neurotransmitter essential for memory and muscle function. Supplementation is believed to support cognitive performance. However, this ingredient deserves caution: some research has linked high intakes of alpha-GPC to increased cardiovascular risk factors. For women focused on heart health, this warrants attention and a conversation with your doctor.

Methylcobalamin (Vitamin B12) is the more bioavailable form of B12, essential for energy production, brain cell protection, and immune function. B12 supplementation can genuinely improve energy levels—but primarily in women who are deficient. If your B12 levels are already normal, extra B12 won’t produce a noticeable energy boost. It’s water-soluble, so excess is simply excreted.

Sucralose—and here’s where it gets concerning. Despite Update’s “zero sugar, zero artificial flavors” marketing, the drink contains sucralose, a widely used artificial sweetener. A clinical trial published in Nutrients found that ten weeks of sucralose consumption induced gut dysbiosis and altered insulin and glucose levels in healthy young adults. For women prioritizing gut health, sucralose is a red flag worth considering.

The Sucralose Problem: Why Your Gut Should Care

Let’s spend a moment on sucralose, because this ingredient undermines much of the “healthy” positioning of Kim Kardashian’s energy drink.

Sucralose was long considered inert—passing through the body without being absorbed. We now know that’s not entirely true. Research published in Frontiers in Physiology showed that six months of sucralose consumption at FDA-approved daily intake levels altered gut microbiome composition, disrupted fecal metabolites, and elevated pro-inflammatory gene expression in the liver of mice. More recent human research from Cedars-Sinai confirmed that artificial sweeteners significantly alter the small bowel microbiome in ways that differ from the large bowel—changes whose long-term consequences are still being studied.

For women who are actively working to support their microbiome through probiotic foods, fermented vegetables, and gut-nourishing meals, regularly consuming sucralose-containing beverages may counteract those efforts. This doesn’t mean one can of Update will destroy your gut health. But daily consumption of any sucralose-containing product is worth reconsidering in light of the emerging evidence.

Who Might Actually Benefit from This Drink?

Despite the sucralose concern, there are women who might find this Kim Kardashian energy drink a genuine improvement over their current caffeine habits. Here’s who might benefit most.

Women who are highly caffeine-sensitive are the strongest candidates. If one cup of coffee gives you heart palpitations, anxiety, or digestive distress, paraxanthine may deliver the alertness you need without those side effects. Caffeine sensitivity often increases with age and during perimenopause, making this relevant for women navigating midlife hormonal shifts.

Women who rely on afternoon caffeine but struggle with sleep could also benefit. Paraxanthine’s shorter half-life means it clears your system faster, potentially allowing you to get an energy boost without sacrificing sleep quality—something that directly impacts weight management, cognitive function, and emotional wellbeing.

Women who want to reduce overall caffeine intake may find paraxanthine useful as a transitional tool. Because it activates similar brain pathways without the full caffeine load, it can help ease the process of cutting back without the withdrawal headaches and energy crashes that make caffeine reduction so difficult.

Who Should Skip It

This drink isn’t for everyone, and honest evaluation means saying that clearly.

Pregnant and breastfeeding women should avoid it entirely. Paraxanthine research in these populations is essentially nonexistent, and the precautionary principle applies. The same caution extends to women with known cardiovascular conditions, given the limited data on alpha-GPC and heart health.

Women actively working on improving their gut microbiome should think twice about the sucralose content. If you’re dealing with bloating, irregular digestion, or conditions like IBS, introducing a sweetener that may disrupt gut bacteria doesn’t align with your wellness goals. Our anti-bloat meal plan is a better starting point than any energy drink.

Anyone who expects an energy drink to replace sleep, nutrition, or exercise is setting themselves up for disappointment. As registered dietitians consistently emphasize, energy drinks—including this one—don’t undo the effects of poor sleep, an imbalanced diet, or chronic stress. They’re a band-aid, not a solution.

Better Ways to Boost Energy Without Any Energy Drink

Before reaching for any energy drink—celebrity-backed or otherwise—consider these evidence-based strategies that address the root causes of fatigue rather than masking symptoms.

Prioritize sleep quality over sleep quantity. Seven hours of deep, restorative sleep beats nine hours of fragmented, poor-quality rest. Create a consistent sleep schedule, keep your bedroom cool and dark, and avoid screens for at least 30 minutes before bed. Cinnamon before bed is one simple ritual that may support better rest.

Eat for sustained energy. Blood sugar crashes are one of the most common causes of afternoon fatigue in women. Pair proteins with complex carbohydrates and healthy fats at every meal. A breakfast of eggs with avocado on whole grain toast will sustain your energy far longer than any energy drink. For more ideas, see our guide to healthy breakfasts for busy women.

Move your body. Even a 10-minute walk increases alertness, improves mood, and boosts oxygen delivery to your brain more effectively than any stimulant. Walking at the right pace also supports fat burning and metabolic health.

Stay hydrated. Dehydration is a hidden cause of fatigue that many women overlook. Before reaching for a stimulant, drink a full glass of water and wait 15 minutes. Often, the “energy crash” you’re feeling is actually your body asking for hydration. Try cinnamon water for a flavorful, metabolism-supporting alternative.

Check your nutrient levels. Chronic fatigue in women is frequently linked to deficiencies in iron, vitamin D, B12, and magnesium. A simple blood panel can identify these gaps, and targeted supplementation—when guided by a healthcare provider—can transform your energy levels naturally. Our complete supplement guide for women breaks down what matters most.

The Bottom Line: Kim Kardashian’s Energy Drink, Honestly Reviewed

The paraxanthine science behind this Kim Kardashian energy drink is genuinely interesting. Early research suggests it may provide caffeine-like alertness with fewer side effects, a shorter half-life, and more consistent results across different genetic profiles. For caffeine-sensitive women, that’s a meaningful advantage.

However, Update is not a health drink. The inclusion of sucralose—a sweetener increasingly linked to gut microbiome disruption—contradicts the “clean” branding. The alpha-GPC ingredient raises cardiovascular questions that deserve more research. And the lack of transparent dosing information prevents consumers from making fully informed choices.

If you want to try it, approach it the way a dietitian would: start with half a can to assess tolerance, don’t make it a daily habit until more long-term research exists, and never use it as a substitute for the fundamentals—quality sleep, balanced nutrition, hydration, and regular movement. Those are the real energy strategies that no celebrity endorsement can replace.