Table 1.

Title, authors and supplements of the included articles in the synthesis.

Article	Title	Supplement
Hahn and Supp 48	Abnormal expression of the vitamin D receptor in keloid scars	Vitamin D
Zhang et al. 39	Vitamin D: a novel therapeutic approach for keloid, an in vitro analysis	Vitamin D
Ince et al. 8	Effect of Vitamin D Deficiency on Hypertrophic Scarring	Vitamin D
Yoon et al. 60	The association between postburn vitamin D deficiency and the biomechanical properties of hypertrophic scars	Vitamin D
Ramakrishnan et al. 41	Response of keloid fibroblasts to vitamin D3 and quercetin treatment - in vitro study	Vitamin D & quercetin
Park et al. 53	Vitamin C attenuates ERK signalling to inhibit the regulation of collagen production by LL-37 in human dermal fibroblasts	Vitamin C
Phan et al. 40	Dietary Compounds Inhibit Proliferation and Contraction of Keloid and Hypertrophic Scar-Derived Fibroblasts In Vitro: Therapeutic Implication for Excessive Scarring	Curcumin & flavonols
Louw and Dannhauser 55	Keloids in rural black South Africans Part 2: dietary fatty acid intake and total phospholipid fatty acid profile in the blood of keloid patients	EFA
Louw 56	Keloids in rural black South Africans. Part 3: a lipid model for the prevention and treatment of keloid formations	EFA
Alonso and Rioja 59	Solanidine and tomatidine trigger scar pruritus	Solanaceae
Howling et al. 43	The effect of chitin and chitosan on the proliferation of human skin fibroblasts and keratinocytes in vitro	Chitin/chitosan