Type the magnesium your gummy label prints for one serving, and how many gummies that serving is. You get the magnesium in each gummy, where the serving sits against the upper limit for supplemental magnesium at your age, and the most gummies a day that stay under it — plus the sugar.
One serving
2 gummies = 100 mg of magnesium 50 mg a gummy · 29% of the 350 mg supplemental limit for an adult, 19+
At most 7 gummies a day stay at or under the 350 mg limit for an adult, 19+ (350 mg).
Type the label’s added sugars to see them against the FDA’s 50 g a day.
| Gummies | Magnesium | Of the limit |
|---|
This is not medical advice and it does not diagnose anything. It does the arithmetic on a label against an official limit; whether you or a child need magnesium at all is a conversation with your doctor or pharmacist — especially with kidney problems or regular medicines.
The magnesium a gummy label prints in its Supplement Facts panel is already the magnesium: NIH ODS says the panel “declares the amount of elemental magnesium in the product, not the weight of the entire magnesium-containing compound”. So 100 mg in a two-gummy serving is 50 mg a gummy, and seven gummies reach the 350 mg upper limit for supplemental magnesium in adults.
How to use it
Type the magnesium from the label’s Supplement Facts panel for one serving, and how many gummies make that serving. Pick who the gummies are for: the upper limit for supplemental magnesium is 350 mg from age 9, but 110 mg at 4 to 8 and 65 mg at 1 to 3. If all you have is a compound weight — “magnesium glycinate 400 mg” on the front of the pack or in an ingredient list — switch to “compound” and pick the form. Add the added sugars if you want them counted. It does not tell you to take anything: that is the conversation with your doctor or pharmacist.
The label, the limit and the arithmetic
NIH ODS (Magnesium fact sheet, updated January 6, 2026): “The Tolerable Upper Intake Level for supplemental magnesium is 350 mg for adults, and it ranges from 65 to 350 mg for children and adolescents, depending on age.” It counts supplements and medicines, not food — ODS: “Too much magnesium from food does not pose a health risk in healthy individuals because the kidneys eliminate excess amounts in the urine”. Past it, “high doses of magnesium from dietary supplements or medications often result in diarrhea that can be accompanied by nausea and abdominal cramping”. The page counts the most whole gummies a day that stay at or under the limit for the age you pick — a ceiling, not a suggestion.
| Age | Limit | 50 mg gummies at or under it |
|---|---|---|
| 1–3 years | 65 mg | 1 |
| 4–8 years | 110 mg | 2 |
| 9–18 years | 350 mg | 7 |
| 19 and over | 350 mg | 7 |
When a pack prints a compound weight instead, the share of magnesium depends on the form — the same formula arithmetic as the Magnesium Form Finder:
| Form | Magnesium by weight | In 400 mg |
|---|---|---|
| Magnesium glycinate | 14.1% | 56 mg |
| Magnesium citrate | 16.2% | 65 mg |
| Magnesium malate | 15.5% | 62 mg |
| Magnesium L-threonate | 8.3% | 33 mg |
| Magnesium oxide | 60.3% | 241 mg |
Worked examples
- 100 mg of magnesium in 2 gummies, for an adult (the page’s example): 50 mg a gummy, the serving is 29% of the 350 mg limit, and at most 7 gummies a day stay at or under it.
- “Magnesium glycinate 400 mg” in 2 gummies: if that is the compound, it is 56 mg of magnesium — 28 mg a gummy. If the Supplement Facts panel says “Magnesium 400 mg”, it is 400 mg of magnesium, and the two-gummy serving is over the adult limit.
- A children’s gummy with 50 mg each, for a 2-year-old: the limit at 1 to 3 is 65 mg, so one gummy a day stays under it and two do not.
Common mistakes
- Converting the panel’s magnesium again. The Supplement Facts line is already the magnesium; only a compound weight needs the form.
- Using the adult limit for a child. It is 65 mg at 1 to 3 and 110 mg at 4 to 8.
- Counting food against the limit. The limit is for supplements and medicines; magnesium from food does not count.
- Treating gummies like sweets. Each one is a dose, and the sugar adds up across the day.
Frequently asked questions
How much magnesium is in magnesium glycinate gummies?
Whatever the Supplement Facts panel prints — NIH ODS says it declares the elemental magnesium, not the compound. If a pack only gives a compound weight, magnesium glycinate is about 14.1% magnesium, so 400 mg of the compound is 56 mg of magnesium.
How many magnesium gummies should I take?
This page does not set a number to take. It shows how much magnesium each gummy holds and the most gummies a day that stay at or under the upper limit for supplemental magnesium — 350 mg for adults. Whether you need any is a question for your doctor or pharmacist.
Are magnesium gummies safe for kids?
The limit for supplemental magnesium is much lower for young children: 65 mg at 1 to 3 years and 110 mg at 4 to 8 (NIH ODS). The calculator counts a child’s gummies against the right one; whether a child needs magnesium is the pediatrician’s call.
What is the difference between magnesium glycinate and magnesium citrate gummies?
The compound around the magnesium: by formula, citrate is about 16.2% magnesium and glycinate 14.1%. The Magnesium Form Finder lists what the sources say each form is used for.
Can you take too much magnesium from gummies?
Yes. Past the upper limit, NIH ODS says high doses from supplements “often result in diarrhea that can be accompanied by nausea and abdominal cramping”. The ladder on this page marks where a pack’s gummies cross the limit.
Do magnesium gummies have sugar?
Most do; it is on the label as added sugars. Type it in and the page sets the day’s sugar against the FDA’s 50 g Daily Value.
Read next
- The Magnesium Form Finder — which form for which job, by two sources each.
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- Performance Lab NutriGenesis Multi review
This is not medical advice, and nothing here diagnoses or treats anything. It does the arithmetic on a label against an official limit; whether you or your child need a supplement at all is a conversation with your doctor or pharmacist. Some links on this site are affiliate links: I buy what I review at full price, and a commission never changes a verdict.