Pros

  • Supports muscle and heart health effectively, making it great for overall muscle maintenance
  • Contains calcium, providing an additional mineral benefit alongside magnesium
  • Formulated for slow, controlled magnesium release to reduce side effects and maintain consistent magnesium levels
  • Gentle on the stomach, can be taken with breakfast without causing upset
  • Recommended by a heart doctor, adding professional credibility to its health claims
  • Trusted and used consistently for over 15 years, demonstrating durability and reliability
  • Does not commonly cause magnesiuelated side effects like diarrhea or cramping
  • Meets expectations for muscle support, especially helpful as you get older

Cons

  • Contains controversial ingredients such as mineral oil, sodium laurel sulfate, Blue #2 dye, maltodextrin, and titanium dioxide, which raise health concerns with prolonged use
  • Titanium dioxide is banned in some countries due to safety worries, making this product questionable for those avoiding such additives
  • Difficult to swallow according to some users despite ingredient claims
  • Some users did not experience relief from muscle cramps, suggesting variable effectiveness depending on individual body chemistry
  • Maltodextrin may pose issues for people with autoimmune conditions or diabetes
  • Reports of persistent muscle cramps in neck, legs, hands, and feet despite taking the supplement
  • Not ideal for those wanting a fully natural or additivree magnesium supplement

Bottom Line

This SlowMag Muscle + Heart Magnesium Chloride with Calcium supplement is a well-established, doctor-recommended option for supporting muscle and heart health with a slow-release formula that’s gentle on the stomach. However, its inclusion of questionable additives like titanium dioxide and artificial dyes may be a turn-off if you prefer a cleaner label or have sensitivities. If you’re looking for a magnesium supplement without these controversial ingredients and potentially easier swallowing, you might want to consider magnesium glycinate-based products instead, which some users find more effective for cramp relief and are often cleaner in formulation.

Lowest at any Popular Retailer
$17.88 at Amazon

Where to Buy

Prices last updated: February 19th 2026 3:43 pm
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