A Smarter Way To Feel Energized

A note from our very own, Dr. Gert Grobler:

This note provides a summary of the pharmacology, safety, and clinical considerations of caffeine, particularly in the context of its inclusion in the Myers Cocktail Oral Therapy.

Caffeine is widely consumed globally, with sources including coffee, tea, soft drinks, and chocolate.

The recommended daily limit for an average adult is 400 mg, except for pregnant women. High doses exceeding 600 mg per day can cause significant side effects such as tachycardia, tremors, insomnia, nervousness, chest pain, and arrhythmias. The recommended limit for children is 2.5 mg per kg of body weight per day.

Recent studies highlight caffeine’s dual nature.

Potential benefits include slowing cellular aging, protecting against certain diseases, and improving cardiometabolic health (200–300 mg/day may lower the risk of cardiometabolic diseases). It has also been linked to longer telomeres in individuals with psychiatric disorders and reduced liver stiffness. However, potential risks include increased cardiovascular risk with chronic high intake (>400 mg/day), a temporary reduction in gray matter volume (reversible after approximately 10 caffeine-free days), and effects on sleep-related brain rhythms. Prenatal exposure may affect offspring adrenal gland development.
Caffeine is rapidly and almost completely absorbed, with maximum concentration reached about one hour after consumption. It is lipophilic and can cross the blood-brain and placental barriers. It is primarily metabolized in the liver (95%) and excreted by the kidneys, with 90% being reabsorbed by renal tubules.

Caffeine can interact with several medications. It can increase side effects of stimulants (e.g., amphetamines, cocaine) and ADHD medications. It may blunt the effectiveness of blood pressure medications like beta-blockers and diuretics. Certain antibiotics (e.g., ciprofloxacin) can slow caffeine metabolism; therefore, a few hours should be allowed between taking these antibiotics and consuming caffeine. Caffeine has a synergistic effect with other antibiotics like amoxicillin and azithromycin. It can decrease the sedative effects of benzodiazepines and reduce the absorption of levothyroxine, requiring a four-hour gap between administration.
Caffeine’s mechanism of action includes antagonism of adenosine receptors (promoting alertness), inhibition of phosphodiesterase enzymes (promoting lipolysis), stimulation of calcium release from intracellular stores (increasing muscle strength/endurance), and antagonism of GABA-A receptors.

The WHO recommends that caffeine intake during pregnancy remain below 300 mg per day. Caffeine has antioxidative properties and may have neuroprotective effects against Alzheimer’s and Parkinson’s diseases. Habitual consumption (3-5 cups/day) is associated with a reduced risk of Alzheimer’s disease, and 3-4 cups/day is associated with a reduced risk of Parkinson’s disease.

Caffeine is associated with a reduction in body weight by increasing basal metabolic rate and energy expenditure.

It may also ameliorate hepatic steatosis by promoting fatty acid oxidation. However, it has been shown to increase insulin resistance and glucose levels in individuals with diabetes, and its use for preventing type 2 diabetes is not recommended without further research.
While food-based dietary guidelines often take a cautious stance on caffeine due to potential risks, there is growing evidence for its potential health benefits when consumed in moderation.