I just do it before bed, and with high carbohydrate meals. You want to avoid it directly pre-workout and directly post-workout. Berberine is probably the strongest over-the-counter glucose disposal agent, personally I like the combination of berberine and cinnamon but you could try alpha lipoic acid, chromium p, mitoburn has some gda effects. If your not concerned with it being otc or Natty there's carderine. And if you want the absolute strongest glucose disposal agent which is not really over the counter but it's easy to get a hold of, metformin. There's also other over-the-counter stuff I just can't think off top of my head right now. Banaba I think is another one
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@sns8778 has multi ingredient gda products as well. I just don't know if any of them do not contain berberine or Dehydroberberine