Magnesium Deficiency: Symptoms, and Supplements (take this)

7 Oct 2025 · 7 min
6:58

YouTube video by Dr. Ashley Lucas explaining magnesium deficiency: prevalence, symptoms, testing limitations, dietary sources, and supplement recommendations. Key claims: ~60–70% of U.S. adults do not meet daily magnesium needs; magnesium supports 300+ enzymatic reactions and affects energy, nerve/muscle function, hormones, blood sugar, blood pressure and sleep; common deficiency signs include cramps, numbness/tingling, palpitations, fatigue/brain fog, headaches/migraines, constipation/nausea, tremor/weakness, and poor stress resilience. Testing: serum magnesium is insensitive (<1% of body magnesium); RBC magnesium better reflects tissue stores (target ~5.8). Supplement and dosing notes: RDA ~400 mg/day; functional practitioners often recommend higher doses; excess magnesium causes diarrhea, nausea, cramping; different magnesium forms suit different goals (glycinate for anxiety/sleep; malate for energy/muscle pain; threonate for cognition; citrate can loosen stools). Product mentions and promotions: Algaecal 'Magnesium Relax' (blend of citrate, malate, bisglycinate, plus vitamin B6, zinc, adaptogens) promoted with a launch-week 20% discount then 10% thereafter via author link; Dr. Ashley also promotes her own electrolyte product containing ~150 mg magnesium. The video includes a call-to-action for PhD Weight Loss and links in the description.

Questions this video answers

About 60–70% of adults (U.S. population claim).

Around 5.8 (RBC magnesium units as stated in the video).

5.5 (RBC magnesium).

Recently ~800 mg/day; at times up to about 890–900 mg/day (combined forms).

About 400 mg/day (as the commonly advised RDA).

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