Fern-C/Fern-C Plus/Fern-C Gold Adverse Reactions

Fern-C: High doses of vitamin C. Nausea, vomiting, heartburn, abdominal cramps, fatigue, flushing, insomnia, and sleepiness have been reported particularly ascorbic acid form.
Fern-C Plus/Fern-C Gold: Vitamin C: Vitamin C is usually tolerated. However, nausea, vomiting, heartburn, abdominal cramps, fatigue, flushing, insomnia, and sleepiness have been reported with high doses of vitamin C, particularly ascorbic acid (i.e., 1 g or more daily).
Zinc: Gastrointestinal side effects such as nausea and vomiting are seen with doses of elemental zinc greater than 40 mg.
Fern-C Gold: Vitamin D₃: Serious side effects of Vitamin D₃ include but are not limited to: Allergic reactions like rash or itching; Swelling of the face, throat, and tongue; Severe dizziness; Trouble breathing; Changed in heart rhythm including irregular or racing heart beat.
Rare Side Effects: Although it doesn't happen very often, Vitamin D can cause: Dry mouth; Headache; Vomiting; Weakness and lack of energy; Fatigue.