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)

3-(4-hydroxy-3-methoxyphenyl)prop-2-enoic acid
Acemannan
AHCC
Alkylglycerols
Aloe vera
Alpha Glucans
Alpha lactalbumin
alpha-glycosyl isoquercitrin
alpha-ketoglutarate (AKG)
alpha-lipoic acid
amino acids
anthocyanins
Antrodia camphorata
astaxanthin
astragalus
Baikal Skullcap
BCAA
benzyl isothiocyanate
beta caryophyllene
Bifidobacteria
Bifidobacterium
Bifidobacterium adolescentis
Bifidobacterium animalis
Bifidobacterium bifidum
Bifidobacterium breve
Bifidobacterium infantis
Bifidobacterium lactis
Bifidobacterium longum
black cumin
black currant
blueberry
Boswellic Acid
branched-chain amino acids
bromelain
C-phycocyanin
cannabidiol
cannabigerol
Cannabis sativa oil
caryophyllene
chamomile
chlorella
Clostridium butyricum
Codonopsis
coenzyme Q10 (CoQ10)
coix
colostrum
curcumin
Curcuminoid
cyclodextrin
d-alpha tocopherol
dithiolthiones
ergothioneine
fish oil
folinic acid
fucoidan
ginger
Glutamine
Glutathione
grape
green tea
Haematococcus pluvialis
hemp
hemp oil
herbal blend (proprietary)
hericium mushroom
HMB hydroxymethylbutyrate
Honokiol
hydroxymethylbutyrate
Hyphomycetes
L-alanyl-L-glutamine
L-carnosine
L-cysteine
L-glutamine
L-glutathione
L-glycine
L-taurine
Lactobacillus
Lactobacillus acidophilus
Lactobacillus brevis
Lactobacillus bulgaricus
Lactobacillus lactis
Lactobacillus plantarum
Lactoferrin
lactoglobulin
Lentinan
Lentinula edodes mycelia
licorice root
lion's mane
luteolin
Marine lipid
Matcha
Melatonin
Mesima
Methylselenocysteine
Milk Protein
Milk thistle
Mistletoe
Mushroom
N-acetyl-cysteine (NAC)
Oldenlandia diffusa
Palmitoylethanolamide (PEA)
Peptides
Phenethyl isothiocyanate (PEITC)
phytocannabinoids
polysaccharides
pomegranate
probiotics
protein
pyridoxal-5-phosphate (P-5-P)
quercetin
reishi mushroom
resveratrol
Saccharomyces boulardii
Saccharomyces cerevisiae
selenium
Selenomethionine
shiitake mushroom
Silychristin
soy isoflavones
spirulina
streptococcus thermophilus
Sulforaphane
Thymidine
Thymoquinone
tributyrin
Turkey tail mushroom
turmeric
Typhonium flagelliforme
Verbascoside
vitamin B6
vitamin C
vitamin E
Whey protein
Zinc

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Metagenics Perfect Protein Whey Vanilla
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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
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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