l-carnitine with apple cider vinegar Amazon.com: Yes You Can! Extra Strength Liquid Fat Burner - Accelerate Metabolism, Natural Ingredients L-Carnitine Apple Cider Vinegar Effervescent:

In addition, AgRP co-localizes with AR in the hypothalamus, androgens regulate metabolic homeostasis by affecting these neurons, and prenatal testosterone or DHT exposure decreases the co-localization of AgRP and insulin receptors, which subsequently affects hepatic insulin sensitivity (4244)

Campone M, Berton-Rigaud D, Joly-Lobbedez F, Baurain JF, Rolland F, Stenzl A, et al

Annual review of nutrition vitamin A and retinoic acid in cognition and cognitive disease (2025) 44:50

Neuronal plasticity: increasing the gain in pain

Although some of the above statements on individual micronutrients are derived from scientific studies, they have been categorised as "not yet sufficiently proven" by official authorities such as the European Food Safety Authority (EFSA), meaning that no positive effect can be confirmed