Carnitine is a compound involved in the transport of long-chain fatty acids into the mitochondria for oxidation. Because of this role, it is marketed as a supplement to accelerate fat burning. However, extensive scientific research has consistently failed to demonstrate that oral carnitine supplementation significantly enhances fat metabolism or athletic performance in healthy individuals.

Carnitine is a compound involved in the transport of fatty acids into the mitochondria for energy production. Athletes often consume carnitine supplements with the expectation that it will enhance fat metabolism and accelerate fat loss. However, current scientific research does not consistently support the claim that oral carnitine supplementation significantly improves fat oxidation or weight loss in healthy, well-nourished individuals.

Amphetamines, cocaine, and caffeine are central nervous system stimulants that increase alertness and physiological arousal. Morphine is an opioid analgesic that acts as a central nervous system depressant. While it is used for pain management, it is not a stimulant and is generally considered detrimental to athletic performance due to its sedative effects.

Bicarbonate is used as an ergogenic aid to help buffer lactic acid and delay fatigue during high-intensity, anaerobic exercises. It works by increasing the blood's buffering capacity, which helps neutralize excess hydrogen ions produced during glycolysis, thereby reducing muscle acidity and delaying the onset of fatigue.

Creatine monohydrate is a popular ergogenic aid used to increase phosphocreatine stores in muscles. A well-documented effect of creatine supplementation is an increase in total body mass, which is primarily attributed to intracellular water retention within the muscle fibers. While some anecdotal reports suggest cramping, scientific evidence generally supports weight gain as the most consistent outcome.

Yohimbine is an alkaloid derived from the bark of the Pausinystalia yohimbe tree. It is sometimes marketed as an ergogenic aid due to its potential effects on the sympathetic nervous system and its purported influence on hormonal pathways, including the stimulation of endogenous steroid production, though scientific evidence regarding its efficacy and safety remains debated.

Both blood doping (the transfusion of red blood cells) and the administration of erythropoietin (a hormone that stimulates red blood cell production) are methods used to increase the oxygen-carrying capacity of the blood. Both are prohibited by anti-doping agencies as they provide an unfair physiological advantage in endurance sports.

Protein requirements vary based on age, weight, and activity level. While 37g is a specific figure provided in the source, modern nutritional guidelines often suggest higher intake based on body weight (e.g., 0.8g per kg). This value should be interpreted as a baseline estimate rather than a universal requirement.

A standard 250ml serving of whole milk typically contains approximately 150 calories. While the option '100 calories' is the closest provided choice, it is an underestimate for whole milk, though it may be accurate for lower-fat or skim milk varieties. Nutritional content can vary based on the fat percentage of the dairy product.

Polyunsaturated fats, found in sources like fish, nuts, and seeds, are considered heart-healthy fats. They help lower LDL cholesterol levels and reduce the risk of heart disease. In contrast, saturated fats are often linked to increased cholesterol levels. While 'unsaturated' is a broad category, polyunsaturated fats are specifically recognized for their positive impact on lipid profiles and overall cardiovascular function.