Currently, a large number of studies have been conducted to improve the cellular uptake of nanoparticles by covalently combining cationic or amphiphilic cell-penetrating peptides to the surface of nanoparticles
If you would prefer to start out with sublingual forms and oral B12 then I recommend this supplement

may cause iron-deficiency anemia Nausea and vomiting particularly with stricturing disease/obstruction Urgency and tenesmus with rectal/colonic involvement Weight loss and malnutrition due to malabsorption, food avoidance, elevated metabolic demand Fever with active inflammation, abscess, or fistula Perianal disease fissures, fistulae, skin tags, abscesses Extraintestinal Manifestations Arthropathy peripheral or axial (enteropathic arthritis, M07.6x) Dermatologic: Erythema nodosum (L52), pyoderma gangrenosum, psoriasis (L40.5) Ocular: Uveitis/iritis (H20.01), episcleritis, scleritis Hepatobiliary: Primary sclerosing cholangitis (K73.2), fatty liver, cholelithiasis Metabolic: Osteopenia/osteoporosis (from steroid use and malabsorption), nephrolithiasis Hematologic: Anemia (iron deficiency, B12/folate deficiency, anemia of chronic disease) When a patient with Crohns disease is admitted with significant weight loss, malnutrition, or protein-calorie deficiency , query the provider to specify the degree of malnutrition (mild, moderate, severe protein-calorie malnutrition)

4.6 Sjgrens Disease Sjgrens disease arises from autoimmune reactions against exocrine glands, especially lacrimal and salivary glands [184, 185]
Each vial is supplied with a purity exceeding 98% , with a molecular formula of C 12 H 11 N 5 and a molecular weight of 225.25 g/mol