What foods or products can be used to allievate hair that is starting to thin a bit up top?

Unaffected by foods: One's primary care doctor can check for medical causes. If none are found, then one can see a dermatologist, especially one specializing in hair restoration (some treatments: minoxidil, finasteride, etc...). Medical causes may include: hormonal problems (low thyroid), seborrhea, alopecia areata, stressful illness. Other causes: genetic male or female pattern baldness, telogen effluvium.