Biotin has many different benefits. These include: contribution to the maintenance of normal hair, skin and mucous membranes, normal energy-yielding metabolism, normal functioning of the nervous system, normal macronutrient metabolism, and normal psychological function.

The frequency of Biotin injections depends on your individual needs and current levels. Generally, for maintenance or mild deficiency, injections are often recommended weekly or bi-weekly until levels stabilize, followed by a monthly regimen, but this should always be determined by a healthcare professional.

Common signs of a Biotin deficiency include: hair thinning or loss, a scaly red rash around the eyes, nose, or mouth, brittle nails, and neurological symptoms like fatigue or depression.

Biotin is naturally found in many foods. Good dietary sources include egg yolks, nuts and seeds, liver and kidney, sweet potatoes, and mushrooms. The friendly bacteria in your gut can also produce some Biotin.

The recommended daily intake for adults is typically around 30 micrograms ($\mu g$) per day. However, therapeutic doses used for supplementation, especially in cases of deficiency or to promote hair/nail growth, can be significantly higher and should be determined by a healthcare professional.