Evidence supporting the use of: L-cysteine
For the health condition: Chemotherapy (reducing side effects)

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Synopsis

Source of validity: Scientific
Rating (out of 5): 2

L-cysteine is an amino acid with antioxidant properties, and there is some scientific rationale for its use in supporting patients undergoing chemotherapy, primarily due to its role as a precursor to glutathione, a major cellular antioxidant. Chemotherapy agents often induce oxidative stress, leading to collateral damage in healthy tissues. L-cysteine supplementation, by boosting glutathione production, may help mitigate this oxidative damage and reduce certain side effects such as mucositis or nephrotoxicity, particularly with drugs like cisplatin.

Some preclinical studies and small human trials have investigated N-acetylcysteine (NAC), a derivative of L-cysteine, for this purpose. NAC has demonstrated protective effects against chemotherapy-induced toxicity in organs such as the kidneys and liver. However, large-scale, high-quality clinical trials using L-cysteine itself (as opposed to NAC) are lacking. There is also a theoretical concern that excessive antioxidant supplementation could reduce the efficacy of chemotherapy by protecting cancer cells in addition to healthy cells.

Overall, while there is a scientific basis and some preliminary evidence for L-cysteine (or its derivatives) in reducing chemotherapy side effects, the evidence is limited and not yet robust. Clinical guidelines do not generally recommend routine use of L-cysteine for this purpose outside of research settings. Physicians should be consulted before considering such supplementation during chemotherapy.

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Other ingredients used for Chemotherapy (reducing side effects)

aloe vera
alpha-glycosyl isoquercitrin
alpha-ketoglutarate (AKG)
amino acids
anthocyanins
astaxanthin
astragalus
beta caryophyllene
bifidobacterium bifidum
bifidobacterium breve
bifidobacterium infantis
bifidobacterium lactis
bifidobacterium longum
black cumin
black currant
blueberry
branched-chain amino acids
bromelain
cannabis sativa oil
chamomile
chlorella
coenzyme Q10 (CoQ10)
colostrum
turmeric
curcumin
cyclodextrin
d-alpha tocopherol
fish oil
ginger
grape
green tea
hemp oil
l-alanyl-l-glutamine
l-carnosine
l-cysteine
l-glutamine
l-glutathione
l-glycine
l-taurine
lactobacillus acidophilus
lactobacillus brevis
lactobacillus bulgaricus
lactobacillus lactis
lactoferrin
lentinula edodes mycelia
licorice root
lion's mane
luteolin
marine lipid
matcha
melatonin
milk thistle
n-acetyl-cysteine (NAC)
pectin
phytocannabinoids
pomegranate
protein
pyridoxal-5-phosphate (P-5-P)
quercetin
reishi mushroom
resveratrol
saccharomyces boulardii
selenium
shiitake mushroom
spirulina
streptococcus thermophilus
tributyrin
turkey tail mushroom
vitamin B6
vitamin C
vitamin E
whey protein
zinc
coix
herbal blend (proprietary)
soy isoflavones
3-(4-hydroxy-3-methoxyphenyl)prop-2-enoic acid
Alpha Glucans
Antrodia camphorata
AHCC
Alpha-Lipoic Acid
Alpha lactalbumin
Acemannan
Alkylglycerols
Bifidobacterium
Baikal Skullcap
Bifidobacterium adolescentis
Boswellic Acid
Bifidobacterium animalis
Bifidobacteria
BCAA
benzyl isothiocyanate
Caryophyllene
Codonopsis
Curcuminoid
C-Phycocyanin
Cannabidiol
Clostridium butyricum
Cannabigerol
Dithiolthiones
Ergothioneine
Milk Protein
Mistletoe

Products containing l-cysteine

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Metagenics Clear Change 10-Day Detox Program with UltraClear Plus pH
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Metagenics Clear Change 10-Day Detox Program with UltraClear Plus Pineapple Banana
Metagenics Clear Change 10-Day Detox Program with UltraClear Plus Vanilla
Metagenics Clear Change 28-Day Detox Program with UltraClear Plus Berry
Metagenics Clear Change 28-Day Detox Program with UltraClear Plus pH Pineapple Banana
Metagenics Clear Change 28-Day Detox Program with UltraClear Plus pH Vanilla
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Designs For Health PaleoCleanse Plus™
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Metagenics Ultra Glucose Control® Chocolate
Metagenics Ultra Glucose Control Chocolate
Metagenics Ultra Glucose Control Vanilla
Metagenics Ultra Glucose Control Vanilla
Metagenics Ultra Potent-C 1000
Metagenics Ultra Potent-C 500
Metagenics Ultra Potent-C Chewable
Metagenics Ultra Potent-C Powder
Metagenics UltraClear Detox Powder
Metagenics UltraClear Plus® Detox Powder
Metagenics UltraClear Plus Detox Powder Berry
Metagenics UltraClear Plus Detox Powder Pineapple/Banana
Metagenics UltraClear Plus pH Detox Powder Pineapple/Banana
Metagenics UltraClear Plus pH Detox Powder Vanilla
Metagenics UltraGI Replenish® Chocolate
Metagenics UltraGI Replenish Chocolate
Metagenics UltraGI Replenish Vanilla
Metagenics UltraGI Replenish Vanilla
Metagenics UltraInflamX Plus 360°® Chocolate/Orange
Metagenics UltraInflamX Plus 360° Mango
Metagenics UltraInflamX Plus 360° Mango
Metagenics UltraInflamX Plus 360° Orange
Metagenics UltraInflamX Plus 360° Original Spice
Metagenics UltraInflamX Plus 360° Pineapple/Banana
Metagenics UltraInflamX Plus 360° Pineapple/Banana
Metagenics UltraMeal Advanced Protein® Dutch Chocolate
Metagenics UltraMeal Advanced Protein French Vanilla
Metagenics UltraMeal Advanced Protein Plain
Metagenics UltraMeal Cardio 360°® Pea/Rice Chocolate
Metagenics UltraMeal Cardio 360° Pea/Rice Vanilla