I am very lean person my ht: 6'0..wt:60iam going to gym.can itake optimun serious mass..i am an athelete as well..

Want weight gain?: Please give more information about your goals and what you have tried already. Thanks.

Nutritionist or MD: That's really low weight for height. you must do two things . Talk to a good Internal Medicine Dr. as well as a good nutritionist.

Not: An issue. It will provide extra calories and extra protein. Drink plenty of water when you are taking this supplement.

You can but: Why do you want to pay for carbs. Optimum Serious Mass contains a lot of carbohydrates per serving. You'd be better suited by purchasing a quality protein source to supplement your meals.

Optimum serious: this should be ok but the amount of protein 100% of the recommended daily allowance in 1 serving is a lot. I would suggest any one using a high protein supplement check their renal function as the high protein load can be harmful to kidneys id they are "sick" to begin with.

Little underweight: Your BMI (weight/height^2) is ~19 kg/m^2 whereas 20 to 25 is the normal range. I am glad to see that u are exercising frequently; this may artificially lower your BMI (especially if you have very little body fat). However, you could also be underweight. A body composition analysis (including anthropometric measurements) are needed to get a better idea; talk to your doctor about getting it done!

Whey protein: Optimal Serious mass is a whey protein and egg albumin meal replacement with added vitamins. As long as you have no liver problems should be OK. However, eat regular meals too!

Supplement: Please see a provider and have routine labs done to check blood counts, electrolytes and thyroid functions as well as cortisol level. At this time i will discourage any such supplements.