L-carnitine is a biologically active form of carnitine that is often used in weight-loss supplements. Carnitine is an amino acid that is necessary for the transportation of fats, from adipocytes to the mitochondria of cells, which is where carnitine is transformed into energy when the body needs it.
This substance is naturally synthesized by the liver and kidneys from essential amino acids, such as lysine and methionine, which are present in some foods, like meat and fish.
L-carnitine supplements can be taken to enhance fat burning, generate more energy for muscles and improve physical performance. Therefore, it is widely consumed by athletes or people looking to lose weight.
Health benefits
Carnitine can offer health benefits such as:
- Boosting immunity, due to its antioxidant action that can eliminate free radicals
- Improving performance when exercising
- Improving blood flow and circulation, which can reduce cramping
- Improving sperm quality in men with reduced fertility
- Reducing fatigue in older adults with low muscle mass or liver damage
- Stimulating cognitive skills such as memory, learning and attention
L-carnitine supplements are widely used for weight loss, however, studies show that this use is quite controversial. Some studies suggest that L-carnitine supplements can increase L-carnitine levels in the body, which can activate oxidation and lead to reducing fat accumulation in obese adults.
However, other studies show what that oral l-carnitine supplements do not later carnitine levels in healthy non-obese adults. Therefore, more scientific studies are needed to prove the benefits of carnitine, as current results are not conclusive.
Types of carnitine
There are different types of carnitine, which are used for different purposes, including:
- Acetyl-L-Carnitine (ALCAR), which is used to improve respiratory capacity
- L-Carnitine L-Tartrate (LCLT), which is used to improve physical performance
- Propionyl L-Carnitine (GPLC), which can be used to relieve intermittent cramping and circulation problems
- L-Carnitine, which is used for weight loss
It is important for carnitine supplementation to be guided by a doctor, as dosing can vary depending on each person's health goals.
How to take
L-carnitine can be purchased in capsule, powder or liquid form. The recommended daily dose varies depending on the purpose of its use.
Carnitine oral solution should be diluted in water and sipped slowly. It can be taken with or without food.
Injectable carnitine should be administered by a healthcare professional, as it is administered slowly intravenously.
Contraindications for use
L-carnitine is not recommended for people with a very low BMI, low fat levels or heart problems. Furthermore, it should not be used by people with hypersensitivity to this amino acid or any other component of the medicine.
Possible side effects
Some of the side effects that can be caused by L-carnitine are nausea, vomiting, diarrhea, abdominal pain, muscle pain, headache, bitter taste in the mouth, anemia and hypercalcemia.