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Evidence depends on the product and claim, and marketing can blur them with injectable medicines

The intensity and duration of withdrawal symptoms depend on the dosage used, the length of treatment, individual metabolism, and whether the medication is immediate-release or extended-release
Alzheimer's disease: epidemiology and clinical progression

Lee KW, Chen W, Junn E, Im JY, Grosso H, Sonsalla PK, et al

You can endoscopically see Intestinal Metaplasia (IM), but there may be an advanced grade of Barretts in an area that was not sampled
