U-100 syringe units are volume, not peptide amount
Converting Dosages from mcg to mL Its key to know how to change dosages from mcg to mL when giving B12 shots

Shipping to United Kingdom Free Premium Standard Shipping with any 50 purchase (5 - 12 business days) Returns and Exchanges Features Benefits: How to use: Major Ingredients Water, Glycerin, Butylene Glycol, Niacinamide, Propandiol, Methylpropanediol, Caprylic/Capric Triglyceride, 1,2-Hexanediol, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Alcohol Denat., PVP, Polysorbate 20, Ammonium Acryloyldimethyltaurate/VP Copolymer, Glutathione, Ethylhexylglycerin, Sorbitan Isostearate, Menthyl Lactate, Adenosine, Glycine, Disodium EDTA, Serine, Glutamic Acid, Melia Azadirachta Leaf Extract, Aspartic Acid, Leucine, Melia Azadirachta Flower Extract, Leucojum Aestivum Bulb Extract, Curcuma Longa (Turmeric) Root Extract, Alanine, Lysine, Arginine, Tyrosine, Phenylalanine, Valine, Threonine, Proline, Isoleucine, Histidine, Methionine, Cysteine, Ocimum Sanctum Leaf Extract, Corallina Officinalis Extract, Tocopherol, Fragrance, Ascorbic Acid Ingredients subject to change at manufacturer's discretion

J Physiol Pharmacol 68(5):765777 Konturek P, Burnat G, Brzozowski T, Zopf YKonturek S, (2008) Tryptophan free diet delays healing of chronic gastric ulcers in rat