Immuno-gG SBI | 120 Capsules: Dietary Supplement! Immuno-gG® SBI is a dairy-free immunoglobulin concentrate formula that supports healthy digestion and immune function. This purified source of immunoglobulin G (IgG) is derived from bovine serum making it free of lactose, casein and β-lactoglobulins. Nutritional Supplements Tags: Digestion, immune function, immune support, nutrition, nutrition supplement, nutrition supplements, supplements.