Magnesium Softgels 500 MG vs 1250 MG: Which Dose to Pick
By Shop All Sports Research Supplements | Sports Research | Published: 2026-10-15
Category: Comparisons
Compare Sports Research magnesium softgels at 500 mg and 1250 mg per softgel, plus a 125 mcg option, to match dose, supply length and budget to your routine.
Quick answer
If you want the most flexible daily dosing, choose the 500 mg softgel and split or stack it to match your target. If you prefer one softgel per day and a higher dose per serving, the 1250 mg softgel is the more direct pick. The 125 mcg softgel is a much smaller dose, so treat it as a separate, low-strength option rather than a substitute for either magnesium dose.
What the three strengths actually deliver
The three Sports Research softgels differ mainly in dose per softgel and bottle count. The 500 mg option gives 500 mg of active ingredient per softgel in a 120-softgel bottle. The 1250 mg option gives 1250 mg per softgel in a 180-softgel bottle. The 125 mcg option gives 125 mcg per softgel in a 360-softgel bottle. Note the unit difference: 125 mcg is micrograms, not milligrams, so it is far smaller than the other two. If your target is a milligram dose, the 125 mcg bottle is not a like-for-like swap.
How to translate your daily target into softgels
Start with your daily magnesium target, then divide by the dose per softgel. For example, a 500 mg target is one 500 mg softgel; a 1000 mg target is two; a 1250 mg target is one 1250 mg softgel or two and a half 500 mg softgels. The 500 mg option lets you hit 500, 1000 or 1500 mg in clean steps, while the 1250 mg option jumps in larger increments. Neither label states a recommended daily intake, so confirm your target with your healthcare provider before choosing a strength.
Supply length and cost per softgel
At one softgel per day, the 500 mg bottle lasts about four months, the 1250 mg bottle about six months, and the 125 mcg bottle about a year. At the listed catalog prices, that works out to roughly 18 cents per softgel for the 500 mg, about 12 cents for the 1250 mg, and about 4 cents for the 125 mcg. The higher-dose bottles cost more up front but less per softgel, so the better value depends on whether you will actually use the full dose.
Trade-offs to weigh before you buy
- 500 mg softgel: Smaller steps let you fine-tune your daily dose, but you may need multiple softgels to reach a high target, and the 120-softgel bottle runs out sooner. Pick this if your target is 500-1000 mg or you like adjusting dose day to day.
- 1250 mg softgel: One softgel covers a high dose and the 180-softgel bottle gives the lowest cost per milligram of the two magnesium options, but the jump between doses is large. Pick this if you want a single daily softgel at a higher dose and a longer supply.
- 125 mcg softgel: The lowest cost per softgel and the longest supply, but it is a microgram dose, so it cannot match a milligram magnesium target. Choose this only if your plan calls for a microgram dose, not a magnesium milligram dose.
Product facts
- 500 MG / 120 Softgels: 500 mg strength, 120 softgels per bottle. Flexible dosing in 500 mg steps and a shorter supply, so it suits people who want to adjust their daily amount.
- 1250 MG / 180 Softgels: 1250 mg per softgel, 180 softgels per bottle. One softgel covers a high daily dose, and the larger bottle stretches further at a lower cost per softgel.
- 125 MCG / 360 Softgels: 125 MCG strength per softgel, 360 softgels per bottle. A microgram dose, not milligrams, so check your target units before treating it as a magnesium dose substitute.
Which dose fits you
Best for
- People who want to fine-tune their daily magnesium in 500 mg steps
- Anyone whose target is 500-1000 mg per day
- Buyers who prefer a shorter bottle to test a dose before committing
Not for
- People who want one softgel to cover a 1250 mg daily target
- Shoppers who want the lowest cost per softgel and a longer supply
- Anyone whose plan calls for a microgram dose rather than a magnesium milligram dose
