Acetyl-L-Carnitine Hydrochloride: What It Is, Benefits, Dosage, and Sources

Acetyl-L-carnitine hydrochloride, often abbreviated as ALCAR HCl, is a specific salt form of acetyl-L-carnitine. It's a compound that naturally occurs in the body, playing a role in energy metabolism, particularly within the brain and muscles. While L-carnitine is broadly known for its involvement in transporting fatty acids into mitochondria for energy production, acetyl-L-carnitine is distinct due to its acetyl group, which allows it to cross the blood-brain barrier more readily. The "hydrochloride" (HCl) simply indicates that it's bound to hydrochloric acid, a common practice in supplement manufacturing to enhance stability and absorption.

This article explores what acetyl-L-carnitine hydrochloride is, its proposed benefits, typical dosages, potential side effects, and how it differs from other carnitine forms.

Definition of Acetyl-L-Carnitine Hydrochloride

Acetyl-L-carnitine hydrochloride is a derivative of L-carnitine, an amino acid-like compound synthesized in the liver and kidneys from lysine and methionine. The key difference lies in the addition of an acetyl group to the L-carnitine molecule. This modification changes its chemical properties, most notably its ability to traverse the blood-brain barrier. The "hydrochloride" part of its name refers to the salt form; it is acetyl-L-carnitine combined with hydrochloric acid. This salt form is often preferred in supplements because it can improve stability and bioavailability, meaning the body might absorb and utilize it more effectively than other forms.

In essence, ALCAR HCl is a more bioavailable and neurologically active form of carnitine. Its primary role in the body is to facilitate the transport of long-chain fatty acids into the mitochondria, the powerhouses of cells, where they are oxidized to produce energy. Beyond this, acetyl-L-carnitine is also involved in the metabolism of acetylcholine, a crucial neurotransmitter for learning and memory, and acts as an antioxidant.

Acetyl-L-Carnitine - Uses, Side Effects, and More

Acetyl-L-carnitine, in its various forms, has been investigated for a range of potential applications, largely stemming from its roles in energy metabolism, neurotransmitter support, and antioxidant activity.

Proposed Uses and Benefits

The primary areas of interest for acetyl-L-carnitine include:

• Cognitive Function: Given its ability to cross the blood-brain barrier and its involvement in acetylcholine synthesis, ALCAR is often explored for its potential to support cognitive health. Research has looked into its effects on memory, focus, and overall brain function, particularly in aging populations or those experiencing cognitive decline. Some studies suggest it may help improve aspects of cognitive performance, though more extensive research is ongoing.
• Nerve Health: ALCAR has been studied for its potential neuroprotective properties. It may help support peripheral nerve health, particularly in conditions involving nerve damage or neuropathy, such as diabetic neuropathy. Its antioxidant effects could play a role in mitigating oxidative stress on nerve cells.
• Mood Support: Some preliminary research suggests ALCAR might have a role in mood regulation, possibly by influencing neurotransmitter levels or reducing cellular stress.
• Energy Production and Fatigue: By assisting in fatty acid transport into mitochondria, ALCAR supports cellular energy production. This has led to investigations into its use for chronic fatigue, exercise performance, and general vitality.
• Antioxidant Activity: ALCAR is recognized for its antioxidant properties, helping to neutralize free radicals that can cause cellular damage. This protective effect may contribute to its broader health benefits.

Potential Side Effects

While generally considered well-tolerated, acetyl-L-carnitine can have side effects, particularly at higher doses. These are typically mild and may include:

• Nausea
• Vomiting
• Diarrhea
• Abdominal cramps
• Restlessness
• Insomnia (if taken late in the day)
• A "fishy" body odor (less common with ALCAR than with L-carnitine, but still possible)

Individuals with certain conditions, such as kidney disease, thyroid issues, or seizures, should exercise caution and consult a healthcare professional before taking ALCAR. It may also interact with certain medications, such as blood thinners or thyroid hormones.

Dosage Considerations

Dosage recommendations for acetyl-L-carnitine vary widely depending on the intended use and individual factors. Typical dosages in studies range from 500 mg to 3,000 mg per day, often divided into two or three doses. It's generally advised to start with a lower dose to assess tolerance and gradually increase if needed. Taking ALCAR with food may help reduce gastrointestinal side effects.

Levacecarnine Hydrochloride | C9H18ClNO4 - PubChem

The term "Levacecarnine hydrochloride" is another name for acetyl-L-carnitine hydrochloride. "Levacecarnine" specifically refers to the L-isomer of acetylcarnitine, which is the biologically active form. The chemical formula C9H18ClNO4 provides a precise molecular description:

• C9: Nine carbon atoms
• H18: Eighteen hydrogen atoms
• Cl: One chlorine atom (from the hydrochloride)
• N: One nitrogen atom
• O4: Four oxygen atoms

This chemical nomenclature is important for chemists and researchers to identify the exact compound and its properties. For the average consumer, understanding that Levacecarnine hydrochloride is synonymous with acetyl-L-carnitine hydrochloride clarifies that they are referring to the same substance, with the "levo-" prefix emphasizing the specific L-configuration that is biologically relevant.

This level of detail, often found in databases like PubChem, highlights the specific stereoisomer and salt form, which are crucial for ensuring the purity and efficacy of a pharmaceutical or supplement ingredient. The L-form is the naturally occurring and biologically active version, distinguishing it from the D-form, which is generally considered inactive or potentially detrimental.

Acetyl-L-Carnitine HCl Salt | CAS 5080-50-2

The Chemical Abstracts Service (CAS) Registry Number 5080-50-2 is a unique numerical identifier assigned to acetyl-L-carnitine hydrochloride. This number is a universally recognized standard for identifying chemical substances, similar to how a Social Security Number identifies an individual.

Importance of CAS Numbers

• Unambiguous Identification: CAS numbers provide a definitive way to identify a chemical, regardless of its various common names, trade names, or chemical formulas. This is particularly important for compounds like acetyl-L-carnitine hydrochloride, which might be referred to as ALCAR HCl, Levacecarnine hydrochloride, or O-Acetyl-L-carnitine.
• Research and Safety: In scientific research, regulatory contexts, and safety data sheets, using CAS numbers ensures that everyone is referring to the exact same chemical. This prevents confusion and potential errors in experiments, manufacturing, or health and safety protocols.
• Quality Control: For supplement manufacturers, specifying the CAS number helps in sourcing the correct, pure ingredient from suppliers, ensuring consistency and quality in their products.

When you see "CAS 5080-50-2" alongside "Acetyl-L-Carnitine HCl salt," it confirms that the product or research is specifically referring to the hydrochloride salt of the L-isomer of acetylcarnitine. This precision is vital in an industry where subtle chemical differences can lead to significant variations in biological activity and safety profiles.

Acetylcarnitine: Uses, Interactions, Mechanism of Action

Acetylcarnitine, generally referring to acetyl-L-carnitine, operates through several interconnected mechanisms within the body, contributing to its diverse range of potential effects.

Mechanism of Action

The primary mechanisms by which acetylcarnitine is thought to exert its effects include:

1. Mitochondrial Energy Production: Like L-carnitine, acetylcarnitine plays a critical role in transporting long-chain fatty acids from the cell cytoplasm into the mitochondrial matrix. Inside the mitochondria, these fatty acids undergo beta-oxidation to produce acetyl-CoA, which then enters the Krebs cycle to generate ATP, the cell's main energy currency. This process is fundamental for energy-intensive tissues like the brain and muscles.
2. Acetyl Group Donation and Acetylcholine Synthesis: The "acetyl" group in acetylcarnitine is not merely for transport. It can be donated to coenzyme A to form acetyl-CoA within the mitochondria. Crucially, acetyl-CoA is a precursor for acetylcholine, a neurotransmitter vital for learning, memory, and muscle contraction. By providing an acetyl group, ALCAR may support acetylcholine production, which is one reason for its proposed cognitive benefits.
3. Antioxidant and Neuroprotective Effects: Acetylcarnitine exhibits antioxidant properties, helping to scavenge reactive oxygen species (free radicals) that can damage cells, particularly neurons. It may also enhance the activity of other endogenous antioxidants, like glutathione. This neuroprotective action is important for mitigating cellular stress and supporting brain health, especially in the face of aging or neurodegenerative processes.
4. Membrane Stabilization: Some research suggests that acetylcarnitine may help stabilize mitochondrial membranes, which are crucial for maintaining mitochondrial function and cellular integrity.
5. Gene Expression Modulation: Emerging research indicates that carnitine derivatives, including acetylcarnitine, might influence gene expression, potentially affecting metabolic pathways and cellular responses to stress.

Interactions

Acetyl-L-carnitine can interact with certain medications and conditions. It's important to be aware of these potential interactions:

• Blood Thinners (Anticoagulants): There is some evidence that carnitine might enhance the effects of blood thinners like warfarin, potentially increasing the risk of bleeding. Individuals on anticoagulant therapy should consult their doctor before taking ALCAR.
• Thyroid Hormones: Carnitine may inhibit the activity of thyroid hormones. Individuals with hypothyroidism or those taking thyroid hormone medication should use ALCAR with caution and under medical supervision.
• Seizure Medications: In some rare cases, carnitine supplementation might lower the seizure threshold in individuals prone to seizures. Consultation with a neurologist is advisable for individuals with epilepsy.
• Kidney Disease: Individuals with severe kidney disease may require specific dosing or avoidance of carnitine supplements, as carnitine is eliminated by the kidneys.
• Diabetes Medications: While ALCAR is studied for its potential benefits in diabetic neuropathy, it could theoretically affect blood sugar levels. Diabetics should monitor their blood glucose closely and consult their doctor.

Always discuss any supplements with a healthcare professional, especially if you have pre-existing health conditions or are taking other medications.

O-Acetyl-L-carnitine =99 titration,powder 5080-50-2

The phrase "O-Acetyl-L-carnitine =99 titration, powder 5080-50-2" describes the specific chemical form, purity, and physical state of acetyl-L-carnitine hydrochloride.

• O-Acetyl-L-carnitine: This refers to the chemical structure where the acetyl group is attached to the oxygen atom (O) of the L-carnitine molecule. This is the precise chemical designation for acetyl-L-carnitine.
• =99 titration: This indicates the purity level of the compound. "99% titration" means that the substance is at least 99% pure, as determined by a chemical analysis method called titration. High purity is crucial for research and pharmaceutical applications to ensure consistent results and minimize the presence of impurities. For supplements, while 99% is excellent, slightly lower purities might still be acceptable, but higher is generally preferred for efficacy and safety.
• Powder: This describes the physical form of the compound. Acetyl-L-carnitine hydrochloride is commonly available as a white crystalline powder, which can then be encapsulated, pressed into tablets, or sold as bulk powder.
• 5080-50-2: As discussed previously, this is the CAS Registry Number, uniquely identifying acetyl-L-carnitine hydrochloride.

This detailed description is typically found on Certificates of Analysis (CoAs) for raw materials used in manufacturing supplements or in chemical supply catalogs. It assures buyers of the exact identity, purity, and physical characteristics of the substance they are obtaining.

Comparing Carnitine Forms: L-Carnitine vs. Acetyl-L-Carnitine vs. Acetyl-L-Carnitine Hydrochloride

Understanding the differences between various carnitine forms can help in choosing the most appropriate supplement for a specific goal. While all carnitine forms play a role in fatty acid metabolism, their chemical structures influence their bioavailability, target tissues, and proposed benefits.

This comparison illustrates that while L-carnitine is foundational for cellular energy, acetyl-L-carnitine, and specifically its hydrochloride salt, offers specialized benefits, particularly for cognitive and neurological health, due to its enhanced ability to enter the brain and its role in neurotransmitter synthesis. The HCl salt form primarily addresses stability and absorption in supplement products.

Sources of Acetyl-L-Carnitine

The body can synthesize L-carnitine from the amino acids lysine and methionine, a process that requires sufficient vitamin C, iron, niacin, and vitamin B6. Acetyl-L-carnitine is then formed from L-carnitine within the body.

While the body produces carnitine, dietary sources also contribute. However, acetyl-L-carnitine itself is not found in high concentrations in most foods. Instead, foods provide L-carnitine, which the body can then convert.

Dietary Sources of L-Carnitine (Precursor to Acetyl-L-Carnitine)

• Red Meat: Beef, lamb, and pork are among the richest sources of L-carnitine. The darker the meat, the higher the carnitine content.
• Fish: Certain fish like cod and salmon contain moderate amounts of L-carnitine.
• Poultry: Chicken breast has some L-carnitine, though generally less than red meat.
• Dairy Products: Milk, cheese, and ice cream contain L-carnitine, but in smaller quantities compared to meat.
• Plant-Based Foods: While not as rich, some plant foods like avocados, tempeh, and whole wheat bread contain trace amounts of L-carnitine.

For individuals with specific health goals related to cognitive function or nerve health, or for those whose dietary intake of L-carnitine is low (e.g., vegetarians or vegans, who may have lower tissue carnitine levels), direct supplementation with acetyl-L-carnitine hydrochloride is often considered. This bypasses the need for the body to synthesize it from L-carnitine and ensures a direct supply of the acetylated form.

FAQ

What is acetyl-L-carnitine hydrochloride used for?

Acetyl-L-carnitine hydrochloride (ALCAR HCl) is primarily used for its potential benefits related to cognitive function, nerve health, and energy production. It's often explored for supporting memory, focus, and overall brain health, particularly in scenarios of aging or cognitive decline. It's also investigated for its neuroprotective properties and its role in reducing fatigue. The hydrochloride form is chosen for its enhanced stability and potential bioavailability as a supplement.

Does L-carnitine affect GABA?

Direct and strong evidence suggesting that L-carnitine or acetyl-L-carnitine directly and significantly affects GABA (gamma-aminobutyric acid) levels is limited. While both are involved in neurotransmission, their primary mechanisms of action are distinct. L-carnitine is more focused on fatty acid transport and energy metabolism, while ALCAR is known for its role in acetylcholine synthesis. While some indirect interactions within the complex neurochemical environment are always possible, ALCAR is not generally considered a primary modulator of GABAergic systems in the same way it is for cholinergic systems.

What are the negative side effects of acetyl-L-carnitine?

Acetyl-L-carnitine is generally well-tolerated, but potential negative side effects can include mild gastrointestinal issues such as nausea, vomiting, diarrhea, and abdominal cramps. Some individuals might experience restlessness or difficulty sleeping if taken too close to bedtime. Less commonly, a "fishy" body odor can occur, though it's more associated with L-carnitine at higher doses. Individuals with pre-existing conditions like kidney disease, thyroid disorders, or seizure disorders should consult a healthcare professional before use due to potential interactions or contraindications.

Conclusion

Acetyl-L-carnitine hydrochloride is a specialized form of L-carnitine that offers distinct advantages, particularly for brain and nerve health, due to its ability to cross the blood-brain barrier and its role in supporting acetylcholine synthesis. As a supplement, its hydrochloride salt form is often preferred for its stability and bioavailability. While generally well-tolerated, understanding its mechanisms, potential benefits, and possible side effects is crucial for anyone considering its use. As with any supplement, consulting a healthcare professional is advisable to determine if ALCAR HCl is appropriate for individual needs and to discuss proper dosage.