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“Studies suggested that greater than or equal to 50 mg ascorbic acid would be required to overcome the inhibitory effects on iron absorption of any meal containing greater than 100 mg tannic acid.”
The American journal of clinical nutrition • 1991 | View Paper
“It is suggested that ascorbic acid promotes iron absorption from the diet by reducing the negative effect on iron absorption of certain ligands such as phytates and tannins present in the diet.”
Human nutrition. Applied nutrition • 1986 | View Paper
“Significant positive correlation between ascorbic acid and tannins (0.551) was an indication to be associated with binding capacity of ascorbic acid over a longer period of storage.”
Journal of environmental biology • 2016 | View Paper
“We found that the protein-precipitating activity of the tannin extracts were increased by 30–75 % when antioxidants ( ascorbic acid or sodium metabisulfite, 5.5 mM) were added in extraction solvents (50% aqueous methanol).”