What is Methylsynephrine / Oxilofrine?
Methylsynephrine, also known as oxilofrine, is a synthetic stimulant compound chemically similar to ephedrine and synephrine. Originally developed as a pharmaceutical drug for treating hypotension (low blood pressure), it has been classified as a banned substance by the World Anti-Doping Agency (WADA) and is prohibited in most athletic competitions. Despite this, methylsynephrine has appeared in some dietary supplements marketed for weight loss and athletic performance enhancement.
The compound is structurally related to naturally occurring synephrine found in bitter orange, but methylsynephrine is synthetically produced and has different pharmacological properties. It acts as a sympathomimetic agent, meaning it mimics the effects of the sympathetic nervous system, leading to increased heart rate, blood pressure, and metabolic rate.
Health benefits & uses
Limited evidence: The claimed benefits of methylsynephrine in supplements include fat burning, increased energy, and enhanced athletic performance. However, there is insufficient scientific evidence to support these claims for supplement use. Most research on methylsynephrine relates to its original pharmaceutical applications for hypotension treatment, not for performance enhancement or weight loss.
The limited studies available suggest potential thermogenic effects, but these come with significant safety concerns that outweigh any potential benefits. No reputable health organizations recommend methylsynephrine for any supplement-based health purposes.
How it works
Methylsynephrine functions as an alpha and beta-adrenergic receptor agonist, stimulating the sympathetic nervous system. It increases the release of norepinephrine and may inhibit its reuptake, leading to enhanced sympathetic activity. This mechanism results in increased heart rate, elevated blood pressure, bronchodilation, and potentially increased lipolysis (fat breakdown).
The compound’s stimulant effects on the cardiovascular system are more pronounced than those of synephrine, making it particularly concerning when used without medical supervision. Its ability to cross the blood-brain barrier may also contribute to central nervous system stimulation.
Dosage
No recommended dosage exists for methylsynephrine as a dietary supplement. There is no established Recommended Dietary Allowance (RDA) or Upper Limit (UL) because it is not recognized as a safe or necessary nutrient. When used pharmaceutically under medical supervision for hypotension, doses typically range from 10-30mg, but this should only occur under strict medical guidance.
Any use of methylsynephrine should be avoided in supplement form. If considering any stimulant-based supplement, consult with a healthcare provider who can recommend safer, evidence-based alternatives.
Food sources
Methylsynephrine does not occur naturally in foods. It is a synthetic compound that may only be found in certain dietary supplements, particularly those marketed for weight loss or pre-workout enhancement. However, its presence in supplements is often undisclosed or mislabeled, making it difficult for consumers to identify.
Natural synephrine, a related but different compound, can be found in bitter orange (Citrus aurantium), but this should not be confused with synthetic methylsynephrine.
Safety & side effects
Methylsynephrine carries significant safety risks and has been associated with serious adverse events. Common side effects include elevated heart rate, increased blood pressure, anxiety, insomnia, headaches, and nausea. More serious concerns include cardiac arrhythmias, hypertension crises, and potential cardiovascular events.
The compound has been linked to several case reports of adverse events, including hospitalizations. Its stimulant effects can be unpredictable and potentially dangerous, especially when combined with other stimulants or in individuals with underlying health conditions. The risk-to-benefit ratio strongly favors avoiding this substance entirely.
Interactions
Methylsynephrine can interact dangerously with numerous medications and supplements. It may enhance the effects of other stimulants, including caffeine, creating additive cardiovascular stress. Interactions with monoamine oxidase inhibitors (MAOIs) can be particularly dangerous, potentially leading to hypertensive crises.
The compound may also interact with blood pressure medications, potentially counteracting their effects or causing unpredictable blood pressure fluctuations. Combining methylsynephrine with other sympathomimetic drugs increases the risk of serious cardiovascular complications.
Who should be cautious
Everyone should avoid methylsynephrine supplements, but certain groups face particularly high risks. Individuals with cardiovascular disease, hypertension, arrhythmias, or any heart conditions should never use products containing this compound. Those with anxiety disorders, hyperthyroidism, or diabetes should also exercise extreme caution.
Pregnant and nursing women, children, and elderly individuals should completely avoid methylsynephrine. Athletes should be aware that methylsynephrine is banned by WADA and can result in positive drug tests and competition disqualification.
Frequently asked questions
Is methylsynephrine the same as synephrine?
No, while chemically related, methylsynephrine is a synthetic compound with different and more potent effects than natural synephrine found in bitter orange. Methylsynephrine carries greater safety risks and is banned in sports.
Why is methylsynephrine banned in sports?
WADA banned methylsynephrine because it provides unfair performance advantages and poses serious health risks to athletes. It’s classified as a prohibited stimulant that can enhance performance while endangering cardiovascular health.
Can methylsynephrine help with weight loss?
While some claim methylsynephrine aids weight loss, there’s insufficient evidence to support this, and the potential risks far outweigh any theoretical benefits. Safer, evidence-based weight management approaches should be pursued instead.
How long does methylsynephrine stay in your system?
The exact elimination time varies, but methylsynephrine can potentially be detected for several days after use. Athletes should avoid any products containing this substance to prevent positive drug tests.
Are there safer alternatives to methylsynephrine?
Yes, numerous safer alternatives exist for energy and weight management, including regular exercise, balanced nutrition, adequate sleep, and evidence-based supplements like green tea extract or caffeine in moderate amounts, always under healthcare provider guidance.
Classification:
Typical dose: — · Studied up to: —
References
Authoritative profile & live regulatory status: Methylsynephrine / Oxilofrine on SupplementIndex →