Which form of applying Minoxidil is better? Injectable or topical?

Hair loss requires an in-person evaluation. I suggest seeing a hair loss expert now to evaluate and go over your condition and provide you information about your best treatment options. There are great non-invasive options like prp/progesterone which work well with Minoxidil. See an expert. Best, Dr. Emer

Comparing topical vs injected Minoxidil is difficult as it depends on other factors besides just the method of delivery. However in general topical is more convenient and more effective than injectable, so it is much more common to see used. 

Thank you for your post and question. Most commonly and safest option would be the Topical Minoxidil at 5% strength. Anything over 5% would require a prescription such as 6% or 7%. You may come across Topical liquid versus Foam Minoxidil, the liquid works better as it is better absorbed to the follicle. Hope this helps. 

This depends on the quality of topical minoxidil and its strengths but if formulated well, topical is the safest most effective for hair loss at 7-9% strength used 1-2x daily.  Injections can be done via mesotherapy along with progesterone and vitamins.  However this requires you to frequently visit your doctor weekly for the injections. Orally and intravenously minoxidil was used as an antihypertensive agent although its use for that now is less common in the US. 

There are two forms of minoxidil, one is the topical which comes in many strengths, the second is the pills which was originally used for the treatment of high blood pressure. The pill, which is rarely used for hair loss in the US and can bring down the blood pressure of the person taking it, is more effective at treating hair loss than the topical