This is likely because they dont see them as being effective or safe enough for commercial return, to justify the research and development costs
Each tablet contains: Carnitine 1110 mg (From L-Carnitine Tartrate) (Carnipure) Non-Medicinal Ingredients: Hyprolose, Cellulose, Stearic Acid (vegetable source), Vegetarian Grade Coating [hypromellose, stearic acid, sunflower lecithin, triethyl citrate], Magnesium Stearate (vegetable source), Silica
In the GI tract, they slow stomach emptying and small-bowel transit, a major reason they reduce post-meal sugar spikes and contribute to feelings of fullness
Over time that adds to the same stress on cells and mitochondria, making it even harder for the body to respond to insulin
doi: 10.1371/journal.pone.0052565 247 WangP.ZhangZ.ChenY.WeiX.FengB.TaoF