Perform a patch test before applying to avoid allergic reactions
Blood may be visible in the urine, and in some cases this is the only symptom (Curhan 2012)

Vegetarian status unknown Unrecognized ingredients: quality-purity-potency-kirkland-signature-vitamin-b12-is-a-factor-in-the-maintenance-of-good-health-and-helps-the-body-to-metabolize-carbohydrates, at, vhelps-to-produce-red-blood-cells-helps-to-prevent-vitamin-b12-deficiency-non-gmo-no-starch-sweeteners, preservatives-vegetari-dosage, adults-19-years-and-older, dissolve-1-tab-der-the-tongue-once-daily, no-lactose-no-icial-each-tablet-contains, medicinal-ingredients-vitamin-b12, methylcobalamin, 1200-mc-non-medicinal-ingredients, alphabetical, croscarmellose-sodun-cospovidone, dimalic-acid, stewvg, vegetable-magnesium-stearate, warning, consult-a-health-care-practitioner-prior-to-use-if-you-are-pregnant-and-breastfeeding, store-between-15c-and-25c, out-of-the-reach-of-children-made-in-canada, fabrique-au-canada-vendor-1-888-446-8874-nutricorp-international, windsor-ontario-n8w-5b5-k2e-1c5, faisant-affaire-au-quebec-sous-le-nom-les-entrepots-costce-do-not-use-if-seal-under-cap-is-broken, manufactured-by, fabrique-par, uaux-for, pour, costco-wholesale-canada-ltd, 415-west-hunt-club-road, ottawa-onta-www-costco-ca-npn-80081901 Some ingredients could not be recognized

J Fluorescence
2.13 Western blot analysis for protein expression SH-SY5Y cells were cultured in six-well plates and subjected to the treatments as described in Section 2.7
Can I take too much vitamin B12