The best blood sugar supplement is the one that passes a margin test

• Chromium

  0.35% of 200 mcg
  1 mL serving (printed)0.7 mcg

  200-1,000 mcg a day in key glucose trials200-1,000 mcg

  Printed on the label: 0.7 mcg per mL (2% DV). (NIH ODS, Chromium)

• Gymnema

  at most 12% of the low end
  1 mL serving, even split9.1 mg

  1 mL serving, label-order ceiling (place 8)25 mg

  200-400 mg a day of extract200-400 mg

  Not printed: #8 in a 200 mg blend of 22. (Drugs.com, Gymnema monograph)

• African mango

  at most 17% of the low end
  1 mL serving, even split9.1 mg

  1 mL serving, label-order ceiling (place 4)50 mg

  300 mg a day (150 mg twice)300 mg

  Not printed: #4 in a 200 mg blend of 22. (NIH ODS, Dietary Supplements for Weight Loss)

• Panax ginseng

  at most 17% of the low end
  1 mL serving, even split9.1 mg

  1 mL serving, label-order ceiling (place 12)17 mg

  From about 100 mg a day of root (up to 20 g)100 mg

  Not printed: #12 in a 200 mg blend of 22. (Shishtar et al., PLoS One 2014)

• Green tea

  at most 20% of the low end
  1 mL serving, even split9.1 mg

  1 mL serving, label-order ceiling (place 7)29 mg

  141-1,207 mg catechins a day141-1,207 mg

  Not printed: #7 in a 200 mg blend of 22. (NIH ODS, Dietary Supplements for Weight Loss)

Red bars: what a 1 mL serving can hold (twice that at 2 droppers, if a dropper is 1 mL). Only the chromium amount is printed; for the blend we show an even split (200 mg / 22, about 9.1 mg per mL) and the most the label order allows. Blue bars: daily study amounts of that ingredient alone; a light extension marks a range. Even the upper limits sit under the studied doses. Where a label prints an extract ratio, it describes how much plant went in, not how strong the extract is (Monagas et al., Front Pharmacol 2022).