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Funding The author(s) declare that financial support was received for the research, authorship, and/or publication of this article

Strengths and limitations The topic of this literature review article is very broad and we have included observational studies, clinical trials, systemic reviews, and meta-analyses

Testosterone and Hormonal Health Testosterone levels in men decline gradually from the mid-thirties onward, with research suggesting an average decline of around 1 to 2% per year after age 40

However, several studies have shown some slight improvements in participants who had taken L-carnitine supplements in larger doses or over long periods of time

Postmortem Cortex Samples Identify Distinct Molecular Subtypes of ALS: Retrotransposon Activation, Oxidative Stress, and Activated Glia