Muscle soreness in your glutes and thighs after restarting running is usually normal delayed-onset soreness from your body adjusting again, not an injury, especially this early. It typically settles within 3 to 5 days as your muscles adapt.
Next Steps
A basic blood panel checking
vitamin D,
B12 and iron is reasonable before adding supplements, since deficiencies are common. Build up your running distance gradually, and add warm-ups plus glute and hamstring strength work to lower injury risk. Whey protein is fine with enough water; discuss creatine with a doctor first if you have any
kidney history.
Health Tips
If the pain is one-sided, sharp, or doesn't ease with rest after a week, please see a physician or sports medicine doctor to rule out an injury.