Key points to consider when interpreting the evidence: Most studies are short-term , typically lasting fewer than 12 weeks, making it difficult to assess long-term efficacy or safety Results appear more pronounced in older adults or individuals with obesity, compared to younger, healthy populations L-carnitine alone, without dietary or lifestyle changes , is unlikely to produce clinically meaningful weight loss Neither NICE nor the NHS recommends L-carnitine supplementation as part of any weight management pathway
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Oxidative stress arises from factors like intense exercise, environmental exposure, and metabolism
Metagenomic sequencing has revealed almost 170 million protein sequences, exceeding 200,000 non-redundant genomes (177), more than 140,000 phage species, and 4,644 prokaryotic species from over 20,000 human gut microbial samples globally (178)
Vitamin B and other water-soluble vitamins need to be distinguished from fat-soluble vitamins such as Vitamin E and Vitamin D, which can be stored in the liver as a reserve
