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Fish oil may improve hair density for some people, but results vary and it won’t fix every cause of shedding.

For most men, finasteride isn’t tied to lasting infertility, but it can change semen volume and sperm counts in a small slice of users.

Finasteride can make hair look thicker by slowing miniaturization and boosting the number of growing hairs over time, mostly on the crown and mid-scalp.

Finasteride can thicken miniaturized hair, yet it rarely creates new growth on smooth, shiny scalp.

A rash after omega-3 capsules is often tied to an allergy or irritation from ingredients, oxidation, or dose timing rather than the fatty acids alone.

Fish oil supplements can trigger headaches for some people, often tied to dose, timing, stomach upset, or how the product is made and stored.

A fish oil supplement can trigger hives or an itchy rash in some people, most often tied to allergy, ingredients, or dose changes.

EPA and DHA may aid recovery and strength for some lifters, while direct muscle-size gains are less certain.

A rash can happen after omega-3 supplements, often from allergy, additives, or dose—stopping the capsules tends to calm it down.

Fish oil’s omega-3s may aid scalp and hair quality for some people, yet proof of new hair regrowth remains limited.