PubMed Ng, F.M., Sun, J., Sharma, L., Libinaki, R., Jiang, W.J., & Gianello, R
A standard curve is constructed, and the active ingredient content is quantified by peak area
Some people feel a lift within hours, while for others it builds over the first day or two
The angle depends on how much fat there is at the site, which is why technique is judged case by case rather than by a fixed rule
A subcutaneous injection uses a short, fine needle to reach that layer, and it does not go as deep as a muscle injection
However, the study grouped dosages of under 50 mg together, making it hard to determine the risk of low dosages of iron, such as those in many multivitamins