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Deb SK, Gough LA, Sparks SA, et al
K.HerbertD.PachecoJ.Fabra GarciaM.ManjonM.et al (2003)
Over time, the same dose produces a weaker effect
For instance, NAD + levels and mitochondrial function have been shown to decline in sarcopenia muscle in one cohort 249 , while another study did not observe a difference in NAD + levels in sarcopenic muscle, and even NR supplementation had no effect on NAD + levels 262
In contrast, L-Carnitine's strengths lie more in its foundational support for energy production and physical endurance, making it a staple for athletes and those focused on cardiovascular and muscular health
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