Acetaminophen + Codeine Side Effects & Health Impacts

Severe vitamin C depletion disrupts collagen hydroxylation, leading to fragile blood vessels, bleeding gums, easy bruising, corkscrew hairs, poor wound healing, anemia and, in advanced cases, scurvy.

Modern case reports and re-analyses of classic scurvy trials show that vitamin C deficiency causes defective collagen and capillary integrity, with slow recovery of scar strength even after repletion if deficiency is prolonged.

Gandhi M et al. Scurvy: rediscovering a forgotten disease. Clin Case Rep. 2023;11(6):e10296835.; Hujoel PP, Hujoel MLA. Vitamin C and scar strength: analysis of a historical trial. Am J Cardiol. 2022;129(1):106-112.; Vissers MCM, Das AB. Re-opening old wounds—vitamin C and wound healing. Am J Clin Nutr. 2022;115(4):795-796.

Moderate vitamin C depletion reduces collagen deposition and antioxidant capacity, which can manifest as slower wound healing, arthralgia and fatigue even before overt scurvy develops.

Systematic reviews report improved healing of chronic wounds with vitamin C supplementation in deficient or high-need states, supporting the clinical impact of inadequate ascorbate on tissue repair.

Bechara N et al. The role of vitamin C in tissue repair and wound healing: a systematic review. Int Wound J. 2022;19(5):1143-1160.; Pope M et al. Scurvy: an elusive diagnosis. Clin Case Rep. 2023;11(4):e7418.

Silymarin from milk thistle has antioxidant and antifibrotic properties in hepatocytes; lack of this protective input in high-stress liver states may permit more oxidative and inflammatory damage, although a formal deficiency state is not defined.

Randomized trials in chronic liver disease show that milk thistle is generally safe but has mixed effects on liver enzymes and histology, suggesting a modest hepatoprotective role in some contexts rather than an essential nutrient function.

Jacobs BP et al. Milk thistle for the treatment of liver disease. Am J Med. 2002;113(6):506-515.; Fried MW et al. Effect of silymarin (milk thistle) on liver disease in patients with chronic hepatitis C. JAMA. 2012;308(3):274-282.; Navarro VJ et al. Silymarin in non-cirrhotics with non-alcoholic steatohepatitis. PLoS One. 2019;14(9):e0221683.

Because well-controlled trials have not demonstrated large improvements in fibrosis or mortality with silymarin, absence of milk thistle is unlikely to cause a distinct clinical syndrome, though it may remove a small protective effect in chronic liver disease.

Controlled trials and meta-analyses indicate no consistent benefit of silymarin on hard liver outcomes, which argues against classifying lack of milk thistle exposure as a clinically meaningful deficiency.

Tanamly MD et al. Randomised double-blinded trial evaluating silymarin in chronic hepatitis C. J Gastroenterol Hepatol. 2004;19(4):435-441.; Ferenci P et al. Randomized, controlled study of silymarin in cirrhosis. J Hepatol. 1989;9(1):105-113.; Jacobs BP et al. Milk thistle for the treatment of liver disease. Am J Med. 2002;113(6):506-515.

Nicotinamide is a NAD+ precursor involved in energy metabolism and lipid/ceramide synthesis in the skin; lower availability may impair barrier recovery, hydration and resilience to irritation.

Clinical trials show that topical and oral nicotinamide can improve stratum corneum barrier function, hydration, acne and atopic dermatitis severity, as well as reduce rates of nonmelanoma skin cancer in high-risk patients, suggesting that insufficient NAD+ support may leave skin more vulnerable.

Draelos ZD et al. Niacinamide-containing facial moisturizer improves skin barrier and hydration. Cutis. 2005;76(2):135-141.; Chen AC et al. A randomized trial of nicotinamide for skin-cancer chemoprevention. N Engl J Med. 2015;373(17):1618-1626.; Zhu JR et al. Niacinamide-containing body emollients improve skin barrier and quality of life in atopic dermatitis. Clin Cosmet Investig Dermatol. 2023;16:10509598.

Lower nicotinamide-driven NAD+ may reduce keratinocyte DNA repair and anti-inflammatory signaling, potentially increasing susceptibility to photoaging and UV-induced lesions.

Mechanistic and clinical research indicates that nicotinamide enhances DNA repair and reduces actinic damage and nonmelanoma skin cancers, supporting an important role for adequate nicotinamide availability in photoprotection.

Boo YC. Mechanistic basis and clinical evidence for the role of nicotinamide in skin health and aging. Int J Mol Sci. 2021;22(6):3380.; Sjöberg T et al. Niacinamide and its impact on stratum corneum hydration and structure. Sci Rep. 2025;15:88899.

N-acetylcysteine is a precursor of cysteine for glutathione synthesis; inadequate NAC availability in high-toxin states can limit hepatic glutathione, increasing vulnerability to oxidative and drug-induced liver injury.

NAC is the standard antidote for acetaminophen overdose, where it replenishes glutathione and prevents hepatic necrosis; this illustrates the consequences of insufficient glutathione precursors under toxic load.

Heard KJ. Acetylcysteine for acetaminophen poisoning. N Engl J Med. 2008;359(3):285-292.; Hodgman MJ, Garrard AR. A review of acetaminophen poisoning. Crit Care Clin. 2012;28(4):499-516.; Licata A et al. N-acetylcysteine for preventing acetaminophen-induced liver injury: a systematic review. Front Pharmacol. 2022;13:828565.