Josie Clean Energy Ingredients

Josie is made with four functional ingredients and nothing else. Here is exactly what is in every can, why it is there, and what the research says.

Lion's Mane Mushroom

Lion's Mane (Hericium erinaceus) is a functional mushroom used in traditional Chinese and Japanese medicine for centuries. It contains two unique bioactive compounds called hericenones and erinacines, which have been studied for their ability to stimulate Nerve Growth Factor production in the brain. NGF supports the growth, maintenance, and repair of nerve cells, which translates to improved focus, memory, and cognitive performance over time.

A 2019 double-blind placebo-controlled trial published in Biomedical Research found significant improvements in cognitive function in healthy adults over 50 after 12 weeks of daily Lion's Mane supplementation. A 2023 study found that a single dose of Lion's Mane extract produced significantly faster performance on the Stroop task, a standard measure of focus and processing speed, 60 minutes after consumption.

Lion's Mane is in Josie because the research is real, the mechanism is understood, and it pairs naturally with natural caffeine to support clean, focused energy rather than a pure stimulant hit.

Cordyceps Mushroom

Cordyceps (Cordyceps militaris) is a functional mushroom used in traditional Tibetan and Chinese medicine for centuries as a tonic for energy and vitality. It contains active compounds including cordycepin and adenosine, which are studied for their role in supporting ATP production and oxygen utilization at the cellular level. More efficient ATP production means more energy available to your muscles and organs during physical and mental exertion.

A 2025 systematic review and meta-analysis published in Frontiers in Nutrition analyzed 14 randomized controlled trials involving 528 athletes and found that Cordyceps supplementation significantly improved endurance performance, ventilatory threshold, and VO2peak. A 2017 study from the Journal of Dietary Supplements found significant improvements in time-to-exhaustion and maximal oxygen uptake in recreationally active adults after three weeks of Cordyceps supplementation.

Cordyceps is in Josie to support the physical energy and endurance side of the formula. While Lion's Mane works on your brain, Cordyceps works on your body.

Vitamin B12

Vitamin B12 (cobalamin) is an essential water-soluble vitamin that supports energy metabolism, red blood cell production, nervous system function, and the synthesis of dopamine and serotonin. It is involved in the metabolism of every cell in the body and plays a critical role in how your cells convert food into usable energy.

B12 deficiency is more common than most people realize and presents gradually as fatigue, brain fog, irritability, and mood changes. Higher risk groups include vegans and vegetarians, people over 50, people taking metformin or proton pump inhibitors, and people with digestive conditions affecting absorption.

B12 is in Josie not as a stimulant but as a foundational nutrient that supports the energy and mood systems the rest of the formula is built around. It is one of the safest and most well-tolerated vitamins available with no known toxicity at standard doses.

Natural Caffeine from Green Tea

Josie uses 65mg of natural caffeine extracted from green tea, the leaf that has powered focused mornings for centuries. Green tea leaves naturally contain L-theanine, the amino acid most often credited with tea's calm and steady reputation, and the finished extract arrives in a clear base with none of coffee's teeth-staining tannins.

At 65mg, Josie's caffeine dose is roughly equivalent to one shot of espresso and about two thirds of a standard 8-ounce cup of coffee. This dose is intentionally moderate. Research published in Frontiers in Psychology found that high-dose caffeine intake of 400mg or more per day has a highly significant association with increased anxiety risk. Josie is formulated for daily drinking, not maximum-dose stimulation.

Natural caffeine from green tea absorbs more gradually than synthetic caffeine anhydrous, producing a smoother onset, a more sustained energy effect, and a less abrupt crash. For people who experience anxiety or jitters from coffee or high-dose energy drinks, the combination of lower caffeine dose and natural source often produces a meaningfully better experience.

What Josie Does Not Contain

  • No sucralose or other artificial sweeteners
  • No caffeine anhydrous or synthetic caffeine
  • No artificial colors or flavors
  • No preservatives
  • No sugar
  • No calories
  • No proprietary blends hiding doses

Every ingredient in Josie is on the label. Every dose is transparent. There is nothing in the can that is not listed above.

The Full Ingredient Panel

Nano filtered water, Cordyceps extract, Lion's Mane extract, natural caffeine from green tea, Vitamin B12, natural flavors, citric acid, malic acid, ascorbic acid, monk fruit extract.

Shop Josie

Try all four flavors at drinkjosie.com/collections/josie-beverages. Cucumber, Lemon-Lime, Mixed Berry, and Tangerine. Zero sugar, zero calories, nothing artificial.