It is similar to walking into a restaurant when the hostess is on break you end up standing around in clusters, while some wander to a random table or just leave without fueling up. For purists, L-carnitines action relative to beta-oxidation occurs between the outer and inner mitochondrial membrane, but lets keep it simple for claritys sake

Caffeine-free Research-backed ingredients and doses Informed Choice certified Multiple flavor options Tart aftertaste Stimulant-free formula may not provide enough energy for some people Beta-alanine can cause a harmless itching or tingling feeling Servings per container: 30| Serving size: 1 scoop| Caffeine content: 200 mg| Key ingredients: L-citrulline malate, beta-alanine, betaine anhydrous, L-tyrosine, taurine, choline bitartrate, vitamin B3 (niacin), vitamin B12, Himalayan sea salt, choline, dimethylethanolamine DL-bitartrate (DMAE) VMI's KXR Stacked Essential features high doses of L-citrulline malate and beta-alanine to boost blood flow, enhance endurance and improve recovery
10.1016/j.ejmech.2022.114115 230 WeiM.GaoY.ChengD.ZhangH.ZhangW.ShenY.et al (2022b)
Thus, even though the production of T4 and T3 is diminished in chronic illness, the reduced transport into the cell will tend to raise serum levels, making the serum T4 and T3 remain normal or high-normal (see Figure 2)