– Kim Kardashian launched an energy drink called Update.
– Update contains paraxanthine instead of caffeine.
– Paraxanthine is the main compound the body makes when it breaks down caffeine.
Kim Kardashian has released an energy drink named Update that advertises zero sugar, zero calories, and no artificial flavors or colors. Rather than using caffeine, Update’s active stimulant is paraxanthine, a molecule the body produces when it metabolizes caffeine. Promotional copy for Update claims it “delivers smooth, steady energy without the jitters, crashes, or sleep disruption commonly associated with traditional energy drinks.”
Update also includes other ingredients commonly found in supplements and energy beverages, such as alpha‑GPC (marketed for cognitive support) and the artificial sweetener sucralose. Health professionals advise talking with your healthcare provider before trying any supplement or energy drink, even those marketed as natural, and to follow recommended dosing.
These interviews have been edited and condensed for clarity and length.
Jennings: Paraxanthine is one of three primary caffeine metabolites produced in the liver after caffeine is consumed. It is the predominant breakdown product; the other two, theobromine and theophylline, are more often linked to caffeine’s unpleasant side effects like anxiety, nausea, diarrhea, and rapid heartbeat.
Zenker: It’s hard to say whether paraxanthine is categorically “better” than caffeine because individual responses vary. Caffeine has a much larger body of research and widespread use, while paraxanthine is an emerging alternative with promising early findings. Paraxanthine may offer comparable or stronger energizing effects with fewer side effects for some people, but more research is needed.
What the early science says
Jennings: Preclinical studies suggest paraxanthine might promote alertness as well as or better than equivalent doses of caffeine, and rodent studies show less toxicity at higher doses compared with caffeine. Preliminary data indicate that avoiding theobromine and theophylline could make paraxanthine more effective and better tolerated.
Zenker: There’s far more data on caffeine’s health effects. Both caffeine and paraxanthine are central nervous system stimulants; they block adenosine receptors, increasing wakefulness and producing similar physiological effects such as raised blood pressure and adrenaline. Paraxanthine may have fewer side effects and possible cognitive benefits beyond caffeine, but it’s not yet widely used in products.
Other ingredients in Update
Jennings: L‑theanine, an amino acid in tea, has evidence suggesting it can improve attention and focus when combined with caffeine. Alpha‑GPC helps produce acetylcholine, a neurotransmitter important for nerve signaling and muscle function, and is often promoted for cognitive support. Methylcobalamin is a bioavailable form of vitamin B12, which supports DNA protection, brain cells, immune function, and energy metabolism.
Zenker: L‑theanine is known for a calming, focused feeling, especially alongside caffeine, but dose matters; without an indicated amount on the label, its effect may be minimal. Alpha‑GPC is generally safe at typical doses, though some research links very high choline intakes with cardiovascular risks; mild side effects can include headache, reflux, nausea, or dizziness. Vitamin B12 supports energy production by helping convert food into ATP; it’s most likely to improve energy in people who are deficient. B12 is water‑soluble, so excess is usually excreted.
Clinical evidence and practical advice
Jennings: Supporting ingredients have preclinical evidence for cognitive benefits and alertness, but high‑quality human clinical trials for paraxanthine and some other components are limited.
Zenker: Consider why you want an energy drink. Occasional use is generally fine, but frequent reliance may point to underlying issues like poor sleep or diet. Energy drinks can provide short‑term effects but don’t replace good sleep, balanced nutrition, exercise, and mental health practices. If trying a new product, begin with a small amount, assess how you feel, and check ingredient lists and active compound amounts. Individual tolerance varies, and not all energy drinks are the same—choose ones aligned with your health priorities.
