fiber and minerals

Fiber can reduce mineral absorption

What's happening

High fiber intake, especially from supplements, can reduce absorption of zinc, iron, calcium, and magnesium.

Recommendation

Take mineral supplements separately from fiber.

Timing

Separate by 2 hours

Sources

— Journal of Nutrition

Frequently Asked Questions

Can I take fiber and minerals together?

Fiber can reduce mineral absorption. Take mineral supplements separately from fiber.

How should I time fiber and minerals?

Separate by 2 hours

Is this interaction dangerous?

This interaction is rated “Caution” by Formulate. High fiber intake, especially from supplements, can reduce absorption of zinc, iron, calcium, and magnesium.

Cited research

Studies from our registry that mention fiber or minerals. Each links to the primary source and the other Formulate pages citing it.

Mentions fiber · 2005
Acetyl-L-carnitine for the treatment of diabetic peripheral neuropathy: a long-term, randomised, double-blind, placebo-controlled study
Sima AA, Calvani M, Mehra M, Amato A · Diabetes Care
52-week RCT (n=1,257) found ALCAR 1000mg three times daily improved vibration perception, sural nerve fiber regeneration, and pain scores in diabetic peripheral neuropathy.

More interactions involving fiber or minerals

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Medical disclaimer. This page is for educational purposes only and does not replace advice from a qualified healthcare provider.

Last medically reviewed: April 21, 2026