does this make sense?

[KenKaniff]

To start, I've run Winny 9 times from 6 different sources and have always felt the same and had the same reactions. Elevated heart rate, slight headache the first couple days at 100mg and a little boost in the vascular department. The current Winny I have from a very reputable source and have been on for 10 days at 100mg a d haven't noticed a single effect I've had every other time I've run it.

I sent the source a question asking if there's a chance it was underdosed or fake based on my lack of reacting to anything. Does his answer below make sense to anyone? I've always felt from day 1 or 2 on Winny that it's brewing in my body haha.

Answer from source: The headache and increased heart rate is something very individual meaning that the a product from a lab can give you headache but you may not experience it with same product of another lab. There are a lot of factors influencing this, even the additional substances used to make the product can influence this. You shouldn't feel much from winstrol in the first week except for an increased desire to workout and maybe a slight increase in strength. Viasual gains and noticeable strength increase should be seen by the end of the second week.*
Anyway, do a lab test of that product and if it shows it's underdosed then we'll reship it and compensate the cost of the lab test.

What kind of lab could test it and can I get it done safely while staying out of trouble or is it not worth trying?