Is the injection painful
Am J Biochem Biotechnol/Am J Biochem Biotechnol 4(2):73

Bariatric surgery Delivery-related blood loss Celiac disease Gastrointestinal blood loss GLP-1 RA medication use Increased Nutrient Needs During Pregnancy & Postpartum Inflammatory bowel disease Malabsorption Menopause & Aging Menstrual cycle MTHFR gene variants Pregnancy Reduce dietary intake from elimination diets Subclinical gut inflammation Signs & Symptoms Brain fog (e.g., iron deficiency) Cheilitis (e.g., riboflavin [B2] deficiency) Constipation (e.g., vitamin B6 deficiency) Fatigue (e.g., vitamin D deficiency) Glossitis (inflammation of the tongue) (e.g., vitamin B12 deficiency) Hair changes (e.g., biotin deficiency) Irritability (e.g., magnesium deficiency) Mouth ulcers (e.g., folate deficiency) Muscle cramps (e.g., magnesium deficiency) Nail changes (e.g., zinc deficiency) Numbness and tingling (e.g., vitamin B12 deficiency) Rashes (e.g., niacin [B3] deficiency) GutsyRx: Your Partner in Gut-Micronutrient Nutrition At GutsyRx, we guide women in optimizing their vitamin and mineral intake through a gut-health-focused approach

[ref][ref] In a study of people with West Nile in Houston, TX, about 20% of the symptomatic people in the study still had continuing fatigue up to 8 years later
A mechanistic approach has gained acceptance recently because it not only provides the rationale to reveal potential mechanisms, but it also predicts and identifies potentially effective chemicals