The vitamin C in Ester-Plex is also buffered to reduce the chance of gastric upset. Ester-Plex contains natural fruit co-factors rich in vitamin C including Acerola Cherry, Citrus Bioflavanoids, Rosehips and Camu Camu.Sanderson Ester-Plexis a potent immune support, especially during winter; it is also an effective antioxidant, and may be beneficial as a support in recovery from injury or at times of stress when the need for vitamin C increases. Ester-Plex uses natural orange flavour and natural sweeteners sucrose, maltodextrin, stevioside & sorbitol. SandersonEster-Plexcontains no artificial flavours or preservatives; and is a low allergy formulation free from lactose, dairy, yeast, wheat, gluten, fish, corn and starch. Ester-Plex Vitamin C is a complex that also includes natural co-factors rich in vitamin C and it is a buffered vitamin C to reduce the risk of gastric upset. Camu Camu is a South American fruit from the Amazon with an extraordinarily high vitamin C content; it is also rich in flavonoids and amino acids serine, valine, and leucine. It is a potent immune support and mood balancer. Rose hips are high in vitamin C and also contain the antioxidant lycopene. A single Acerola cherry has 65 times more vitamin C than a orange and is second only to Camu camu in tems of natural vitamin C content.