What is carnosine?
Carnosine (beta-alanyl-L-histidine) is a natural dipeptide -- a two-amino-acid compound consisting of beta-alanine and L-histidine. Carnosine is found in concentrated form in skeletal muscle, heart muscle, and the brain.
The name carnosine derives from the Latin word "caro" (meat), as it was first discovered in meat extract in 1900. In the human body, carnosine content is highest in fast-twitch (type II) muscle fibers.
How carnosine works
Carnosine plays several important roles in the body:
- Muscle buffering: Carnosine helps buffer hydrogen ions in muscle tissue that form during intense exercise. This helps maintain optimal pH levels in the muscle
- Anti-glycation: Research shows carnosine can bind reactive sugar compounds that may damage proteins -- a process called glycation inhibition
- Antioxidant activity: Carnosine may bind certain reactive oxygen species and metal ions
- Neurotransmitter modulation: In the brain, carnosine may influence certain neurotransmitter releases
Evidence and benefits
Research on carnosine spans several areas:
Muscle pH buffering: This is carnosine's best-documented function. Carnosine helps keep muscle cell pH stable during intense exercise (Harris et al., 2006). However, it is important to note that beta-alanine (carnosine's precursor) is a more effective supplement for raising muscle carnosine levels, since oral carnosine is broken down in the digestive tract before absorption (Derave et al., 2010).
Glycation inhibition: Laboratory studies have shown that carnosine can inhibit advanced glycation end-products (AGEs) (Hipkiss et al., 1998; Boldyrev et al., 2013). These are compounds formed by the reaction of sugars with proteins that may damage tissues. Clinical evidence in humans is limited.
Aging: Carnosine's potential role in aging processes has been studied, including cellular aging and oxidative stress (Boldyrev et al., 2013). Results are preliminary and come primarily from in vitro and animal studies.
Brain health: Carnosine is found in significant quantities in the brain and its role in brain function has been investigated. Clinical data is limited.
Important note: Carnosine does not currently have a specific EFSA-approved health claim. Much of the research has been conducted in vitro or in animal models, and human studies are limited.
How to take carnosine
Typical dose: Studies have used doses ranging from 500-2000 mg per day, often divided into two doses.
Carnosine vs beta-alanine: For raising muscle carnosine levels, beta-alanine is the more effective supplement choice, since oral carnosine is broken down in the digestive tract into beta-alanine and histidine before absorption. Carnosine supplements are preferred more for their direct anti-glycation and antioxidant potential.
Timing: Specific timing is not critically important. Can be taken with food.
Precautions: Carnosine is generally well-tolerated. Consult your doctor if you take medications. Insufficient safety data exists for pregnant and breastfeeding women.
Who should consider carnosine?
People who may consider carnosine supplementation include:
- Those interested in glycation inhibition research
- Older adults looking for potential aging-support supplements based on research
- Athletes already using beta-alanine who want to add carnosine for its direct properties
- Those interested in antioxidant support
Frequently asked questions
What is the difference between carnosine and beta-alanine? Beta-alanine is the precursor to carnosine. For raising muscle carnosine levels, beta-alanine is more effective since it is the rate-limiting factor in muscle carnosine synthesis. Carnosine supplements are taken more for their direct biochemical properties (such as anti-glycation).
Can you get carnosine from food? Carnosine is found primarily in red meat, poultry, and fish. Vegetarians and vegans get little or no carnosine from food, which is why their muscle carnosine levels are typically lower (Everaert et al., 2011).
Is carnosine broken down in the digestive tract? Yes, the enzyme carnosinase breaks down oral carnosine into beta-alanine and histidine. This is why beta-alanine is more effective for raising muscle carnosine. However, some carnosine may be absorbed intact.
Is carnosine safe for long-term use? Long-term use has been less studied. Available data suggest good tolerability, but definitive conclusions are lacking.
Why is carnosine more concentrated in fast-twitch muscle fibers? Fast-twitch fibers (type II) produce more acidity during intense exercise. Higher carnosine content helps buffer this acidity, supporting muscle function.
References
- Harris RC, Tallon MJ, Dunnett M, Boobis L, Coakley J, Kim HJ, Fallowfield JL, Hill CA, Sale C, Wise JA. (2006). The absorption of orally supplied beta-alanine and its effect on muscle carnosine synthesis in human vastus lateralis. Amino Acids, 30(3), 279–289.
- Hipkiss AR, Brownson C, Carrier MJ. (1998). Carnosine, the anti-ageing, anti-oxidant dipeptide, may react with protein carbonyl groups. Mechanisms of Ageing and Development, 122(13), 1431–1445.
- Boldyrev AA, Aldini G, Derave W. (2013). Physiology and pathophysiology of carnosine. Physiological Reviews, 93(4), 1803–1845.
- Derave W, Everaert I, Beeckman S, Baguet A. (2010). Muscle carnosine metabolism and beta-alanine supplementation in relation to exercise and training. Sports Medicine, 40(3), 247–263.
- Everaert I, Mooyaart A, Baguet A, Zutiber A, Baelde H, Achten E, Taes Y, De Heer E, Derave W. (2011). Vegetarianism, female gender and increasing age, but not CNDP1 genotype, are associated with reduced muscle carnosine levels in humans. Amino Acids, 40(4), 1221–1229.
See also:
Browse sports supplements at MaxFit.
Disclaimer
A food supplement is not a substitute for a varied and balanced diet and a healthy lifestyle.
