Douglas Laboratories Magnesium Oxide, 100 Capsules

Brand: Douglas Laboratories
Category: Magnesium
Recorded price: $11.50; 5 Sep 2026
Price per serving: $0.12

Supplement facts

Serving size: 1 Vegetarian Capsule(s)
Servings per container: 100

Ingredient	Amount per serving	% daily value
Magnesium	300 mg	71%

Other ingredients

Hydroxypropyl Methylcellulose
Microcrystalline Cellulose
Carnauba wax
Ascorbyl Palmitate
Hydroxypropyl Cellulose
Silica

Directions on the label

Suggested Usage: As a dietary supplement, adults take 1 capsule daily or as directed by your health professional.

Label data from the Dietary Supplement Label Database.

Label data as of 6 Sep 2026

Product score

80 / 100Very good

Category average: 76 / 100
Average for similar products: 88.3 / 100

A straightforward once-daily magnesium supplement with a substantial declared dose, but magnesium oxide is less preferable than forms with better-established absorption and tolerability.

Scoring criteria

Quantity
100 / 100
The capsule provides 300 mg of magnesium, a reasonable supplemental amount for the stated general role.
Form
60 / 100
Magnesium oxide has relatively limited solubility and absorption compared with better-soluble forms, with potential for laxative effects.
Convenience
100 / 100
The label directs adults to take one capsule daily, and the bottle contains 100 servings.
Label accuracy
100 / 100
The declared 300 mg magnesium dose and 71% Daily Value are internally consistent, with no contradictory claims supplied.
Purity
75 / 100
No product-specific testing or quality-control evidence is supplied, so purity remains at the ordinary unresolved mark.
Cofactors
0 / 100
No separately quantified supporting ingredient is declared.