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Marine Based Magnesium 500 mg

Nature's Answer
4.7
★ ★ ★ ★ ★
(1853 ratings)
Magnesium 500 mg
Product Image
Score 40.0

A marine-sourced magnesium supplement predominantly featuring low-bioavailability forms, making it less effective for systemic absorption and more for laxative purposes.

Quantity: 90 Capsule(s)Servings size: 2 Capsule(s) (45 servings)
Selected goals:
Other goals:
Stress Relief
Mood Support
Bone Health
Sleep Support
General Health

Score 40.0

A marine-sourced magnesium supplement predominantly featuring low-bioavailability forms, making it less effective for systemic absorption and more for laxative purposes.

Analysis

Nature's Answer Marine Based Magnesium 500 mg derives its magnesium from Magnesium Hydroxide and Aquamin Seawater, along with some calcium. Magnesium Hydroxide, similar to magnesium oxide, has very poor bioavailability for systemic absorption and is predominantly used as a laxative. While the 'marine-based' and 'Aquamin' sourcing may appeal to those seeking natural ingredients, the forms of magnesium present do not offer superior absorption compared to more bioavailable chelates. Consequently, its effectiveness in truly increasing systemic magnesium levels for most health goals is limited, and it's relatively expensive for the forms provided.

Pros
  • Sourced from natural marine origins (Aquamin seawater), which may appeal to consumers seeking natural ingredients.
  • Provides a substantial elemental magnesium dose, though much is poorly absorbed.
Cons
  • Relies primarily on magnesium hydroxide and similar forms from seawater, which have low bioavailability for systemic use.
  • Less effective for addressing magnesium deficiencies compared to highly bioavailable chelated forms.
  • Relatively expensive given the low absorption efficiency of the magnesium forms.
Warnings
  • May cause laxative effects or digestive upset due to the low absorption rate of magnesium hydroxide.
$17.24($0.38 per serving)
Amazon
$ 17.24
iHerb
$ 17.24
Vitacost
$ 17.24
Ingredients
IngredientAmount per serving
Calcium (Seawater, Aquamin Red Algae) 25 mg
Magnesium (Magnesium Hydroxide, Aquamin Seawater) 500 mg
Sodium 15 mg
Gluten Free Adults 18–50 Vegan Vegetarian
Categories
Magnesium 40.0
Despite its natural sourcing, the product's reliance on poorly absorbed magnesium forms makes it a less effective option within the magnesium collection.
Goals
General Health 35.0
Low bioavailability of marine-derived forms means poor systemic absorption for comprehensive general health benefits.
Bone Health 35.0
While it contains some calcium, the low magnesium bioavailability limits its effectiveness for comprehensive bone health.
Energy 30.0
Minimal absorption limits its ability to support cellular energy production effectively.
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★★★★★
(71611 ratings)
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90 Value

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NOW
4.8
★★★★★
(16706 ratings)
Offers a comprehensive marine-derived mineral complex with significantly better magnesium forms (Glycinate, Taurinate, Citrate) along with other key nutrients at a lower price per serving, representing superior overall value.
85 Value

Magnesium Caps 400 mg

NOW
4.8
★★★★★
(29689 ratings)
Provides a multi-magnesium blend including well-absorbed Citrate and Aspartate at a dramatically lower price, offering much better value for magnesium absorption for general health.
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4.8
★★★★★
(16706 ratings)
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95 Performance

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Country Life
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★★★★★
(4315 ratings)
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90 Performance

Magnesium Caps 500 mg

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4.8
★★★★★
(71611 ratings)
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