l-carnitine levels in energy drinks LeanShots Liquid Shot (3000mg) Alani Nu Breezeberry Energy Drink

L-carnitine ameliorated fasting-induced fatigue, hunger, and metabolic abnormalities in patients with metabolic syndrome: a randomized controlled study

They found that probiotic supplementation significantly reduced the frequency of migraine attacks, the frequency of drug use, digestive problems, zonulin levels, and Hs-CRP levels (213)

Quick answer: Food carnitine is absorbed better than supplemental L-carnitine, but healthy adults generally make enough carnitine even when dietary intake is low

WangDDMaoYZYangYWangTYZhuPHeSMet alEffects of sodium-glucose cotransporter-2 inhibitors on weight in type 2 diabetes mellitus and therapeutic regimen recommendation

Fish oil is more potent than flaxseed oil in modulating gut microbiota and reducing trimethylamine-N-oxide-exacerbated atherogenesis

But the evidence is mixed, study quality is variable, and benefits in pregnancy or live birth are much harder to prove consistently