Last update
5/7/2026
Reviewed By
Overview
SCIENTIFIC SCORE
Moderately Effective
Based on 4 Researches
8.3
USERS' SCORE
Good
Based on 5 Reviews
8.4
Supplement Facts
Serving Size: 1 Capsule
Amount Per Serving
%DV
L-Carnitine (as L-Carnitine Tartrate)
500 mg
†
Top Medical Research Studies
9
We looked into how L-carnitine might help children facing myocardial injury during open-heart surgery. In our study involving 60 children with congenital heart disease, we split participants into two groups: one received L-carnitine before surgery, while the other got a placebo.
The findings were promising; the L-carnitine group showed lower levels of harmful markers indicating heart damage after surgery and better heart function compared to the placebo group. Overall, we found that L-carnitine may protect the heart and improve recovery in these young patients.
The findings were promising; the L-carnitine group showed lower levels of harmful markers indicating heart damage after surgery and better heart function compared to the placebo group. Overall, we found that L-carnitine may protect the heart and improve recovery in these young patients.
Read More
9
We explored the effects of L-Carnitine treatment on short QT syndrome type 1 (SQT1) using transgenic rabbit models. Our findings indicated that L-Carnitine and C16-Carnitine treatment effectively prolonged QT intervals and normalized action potentials in SQT1 rabbits. This suggests a direct benefit in managing this genetic heart condition. However, while promising, further study is necessary before L-Carnitine can be fully endorsed as a treatment for SQT1.
Read More
8
We explored the effects of the PDHA1 gene on heart health by creating human heart cells that lacked this gene. Our findings showed that these modified cells developed signs of heart disease, including enlarged cell size and impaired calcium handling, leading to decreased heart contractility.
Interestingly, when we used l-carnitine to boost energy production in these cells, we found that it helped stabilize calcium levels and prevented further heart damage. This suggests that enhancing energy metabolism could be a promising strategy for managing heart issues linked to PDHA1 deficiency.
Interestingly, when we used l-carnitine to boost energy production in these cells, we found that it helped stabilize calcium levels and prevented further heart damage. This suggests that enhancing energy metabolism could be a promising strategy for managing heart issues linked to PDHA1 deficiency.
Read More
Most Useful Reviews
7.5
Helps heart issues
7 people found this helpful
Dr Sinatra recommends this product as the best form of carnitine for Myalgic Encephalomyelitis, and it has notably benefitted my heart problems. My ability to remain upright improved drastically from just 10 minutes to about 20. Additionally, combining it with ubiquinol has given me further strength. Dr Sinatra calls these two, along with ribose and magnesium, the 'awesome foursome' for cardiac health.
Read More
9
Increased daily energy
3 people found this helpful
This product has been a blessing for my heart condition. It has significantly increased my energy levels throughout the day, allowing me to walk and shop without shortness of breath. A pleasant side effect is that I've lost a few pounds as well.
Read More
9
Supports heart recovery
2 people found this helpful
After struggling with congestive heart failure, I began using this product to aid my recovery as I resumed exercising. The positive results were clear; I felt significantly better during workouts. I've continued taking this for around four years and it has consistently supported my heart health.
Read More
Medical Researches
SCIENTIFIC SCORE
Moderately Effective
Based on 4 Researches
8.3
- All Researches
9
We explored the effects of L-Carnitine treatment on short QT syndrome type 1 (SQT1) using transgenic rabbit models. Our findings indicated that L-Carnitine and C16-Carnitine treatment effectively prolonged QT intervals and normalized action potentials in SQT1 rabbits. This suggests a direct benefit in managing this genetic heart condition. However, while promising, further study is necessary before L-Carnitine can be fully endorsed as a treatment for SQT1.
Read More
9
We looked into how L-carnitine might help children facing myocardial injury during open-heart surgery. In our study involving 60 children with congenital heart disease, we split participants into two groups: one received L-carnitine before surgery, while the other got a placebo.
The findings were promising; the L-carnitine group showed lower levels of harmful markers indicating heart damage after surgery and better heart function compared to the placebo group. Overall, we found that L-carnitine may protect the heart and improve recovery in these young patients.
The findings were promising; the L-carnitine group showed lower levels of harmful markers indicating heart damage after surgery and better heart function compared to the placebo group. Overall, we found that L-carnitine may protect the heart and improve recovery in these young patients.
Read More
8
We explored the effects of the PDHA1 gene on heart health by creating human heart cells that lacked this gene. Our findings showed that these modified cells developed signs of heart disease, including enlarged cell size and impaired calcium handling, leading to decreased heart contractility.
Interestingly, when we used l-carnitine to boost energy production in these cells, we found that it helped stabilize calcium levels and prevented further heart damage. This suggests that enhancing energy metabolism could be a promising strategy for managing heart issues linked to PDHA1 deficiency.
Interestingly, when we used l-carnitine to boost energy production in these cells, we found that it helped stabilize calcium levels and prevented further heart damage. This suggests that enhancing energy metabolism could be a promising strategy for managing heart issues linked to PDHA1 deficiency.
Read More
7
This pilot study set out to understand how heart failure (HF) treatment influences the levels of serum carnitines in patients with both preserved and reduced ejection fractions. We found that in patients with HFpEF—especially those with hypertension—the reduction of acylcarnitines to free carnitines (AC/FC) after treatment correlated with improvements in heart function.
However, similar benefits weren't observed in patients with HFrEF. These findings suggest that while L-carnitine treatment may help in specific heart failure types, more extensive research is needed to confirm these results and understand the mechanisms involved.
However, similar benefits weren't observed in patients with HFrEF. These findings suggest that while L-carnitine treatment may help in specific heart failure types, more extensive research is needed to confirm these results and understand the mechanisms involved.
Read More
User Reviews
USERS' SCORE
Good
Based on 5 Reviews
8.4
- All Reviews
- Positive Reviews
- Negative Reviews
7.5
Helps heart issues
7 people found this helpful
Dr Sinatra recommends this product as the best form of carnitine for Myalgic Encephalomyelitis, and it has notably benefitted my heart problems. My ability to remain upright improved drastically from just 10 minutes to about 20. Additionally, combining it with ubiquinol has given me further strength. Dr Sinatra calls these two, along with ribose and magnesium, the 'awesome foursome' for cardiac health.
Read More
9
Increased daily energy
3 people found this helpful
This product has been a blessing for my heart condition. It has significantly increased my energy levels throughout the day, allowing me to walk and shop without shortness of breath. A pleasant side effect is that I've lost a few pounds as well.
Read More
9
Supports heart recovery
2 people found this helpful
After struggling with congestive heart failure, I began using this product to aid my recovery as I resumed exercising. The positive results were clear; I felt significantly better during workouts. I've continued taking this for around four years and it has consistently supported my heart health.
Read More
9
Improved ejection fraction
1 people found this helpful
Our physician advised using this product alongside Coenzyme Q10 and D-Ribose for better heart health. This approach notably elevated my husband's previously low ejection fraction to normal levels. We continue to use L-carnitine to maintain his heart health, appreciating its positive effects.
Read More
6
Effective for heart
1 people found this helpful
This product works brilliantly for my heart health and enhances my sports performance.
Read More
Frequently Asked Questions
9
Supports heart recovery
2 people found this helpful
After struggling with congestive heart failure, I began using this product to aid my recovery as I resumed exercising. The positive results were clear; I felt significantly better during workouts. I've continued taking this for around four years and it has consistently supported my heart health.
9
Improved ejection fraction
1 people found this helpful
Our physician advised using this product alongside Coenzyme Q10 and D-Ribose for better heart health. This approach notably elevated my husband's previously low ejection fraction to normal levels. We continue to use L-carnitine to maintain his heart health, appreciating its positive effects.
9
Increased daily energy
3 people found this helpful
This product has been a blessing for my heart condition. It has significantly increased my energy levels throughout the day, allowing me to walk and shop without shortness of breath. A pleasant side effect is that I've lost a few pounds as well.
7.5
Helps heart issues
7 people found this helpful
Dr Sinatra recommends this product as the best form of carnitine for Myalgic Encephalomyelitis, and it has notably benefitted my heart problems. My ability to remain upright improved drastically from just 10 minutes to about 20. Additionally, combining it with ubiquinol has given me further strength. Dr Sinatra calls these two, along with ribose and magnesium, the 'awesome foursome' for cardiac health.
8
We explored the effects of the PDHA1 gene on heart health by creating human heart cells that lacked this gene. Our findings showed that these modified cells developed signs of heart disease, including enlarged cell size and impaired calcium handling, leading to decreased heart contractility.
Interestingly, when we used l-carnitine to boost energy production in these cells, we found that it helped stabilize calcium levels and prevented further heart damage. This suggests that enhancing energy metabolism could be a promising strategy for managing heart issues linked to PDHA1 deficiency.
Interestingly, when we used l-carnitine to boost energy production in these cells, we found that it helped stabilize calcium levels and prevented further heart damage. This suggests that enhancing energy metabolism could be a promising strategy for managing heart issues linked to PDHA1 deficiency.
7
This pilot study set out to understand how heart failure (HF) treatment influences the levels of serum carnitines in patients with both preserved and reduced ejection fractions. We found that in patients with HFpEF—especially those with hypertension—the reduction of acylcarnitines to free carnitines (AC/FC) after treatment correlated with improvements in heart function.
However, similar benefits weren't observed in patients with HFrEF. These findings suggest that while L-carnitine treatment may help in specific heart failure types, more extensive research is needed to confirm these results and understand the mechanisms involved.
However, similar benefits weren't observed in patients with HFrEF. These findings suggest that while L-carnitine treatment may help in specific heart failure types, more extensive research is needed to confirm these results and understand the mechanisms involved.
9
We looked into how L-carnitine might help children facing myocardial injury during open-heart surgery. In our study involving 60 children with congenital heart disease, we split participants into two groups: one received L-carnitine before surgery, while the other got a placebo.
The findings were promising; the L-carnitine group showed lower levels of harmful markers indicating heart damage after surgery and better heart function compared to the placebo group. Overall, we found that L-carnitine may protect the heart and improve recovery in these young patients.
The findings were promising; the L-carnitine group showed lower levels of harmful markers indicating heart damage after surgery and better heart function compared to the placebo group. Overall, we found that L-carnitine may protect the heart and improve recovery in these young patients.
References
- Sun J, Hua C, Zhang J, Ding N, Liu Y, et al. Decreased energy production and Ca homeostasis imbalance induce myocardial hypertrophy in PDHA1-deficient human pluripotent stem cell derived cardiomyocytes. Life Sci. 2025;364:123439. 10.1016/j.lfs.2025.123439
- Harada H, Nishiyama Y, Katoh A, Niiyama H, Iwaki A, et al. Heart failure treatment and serum carnitines in HFpEF and HFrEF with or without hypertension - a pilot study. Hypertens Res. 2025;48:1109. 10.1038/s41440-025-02106-1
- Bodi I, Mettke L, Michaelides K, Hornyik T, Meier S, et al. Beneficial normalization of cardiac repolarization by carnitine in transgenic short QT syndrome type 1 rabbit models. Cardiovasc Res. 2024;120:1550. 10.1093/cvr/cvae149
- El Feky W, El-Afify D, Abdelhai D, Elkashlan M, Fakhreldin A, et al. L-carnitine decreases myocardial injury in children undergoing open-heart surgery: A randomized controlled trial. Eur J Pediatr. 2024;183:2783. 10.1007/s00431-024-05534-2
