When it comes to vitamin c tablets it’s pretty unnecessary if your feeding the correct diet.
Probably the best and perhaps the healthiest way for your guinea pig to get a proper amount of vitamin C per day is through feeding fresh foods (veggies) that are rich in vitamin C.
However if your guinea pig is ill, or pregnant or requires extra dietary support you want to look for chewable 100mg vitamin C tablets, which when quartered will add 25 mg to a guinea pig's intake.
Some people use liquid vitamin C, which can be found at some health food stores but this should be syringed into the guinea pigs mouth and not added to water, as when added to water it will lower the guinea pigs water intake due to the changes it causes to the taste and this can subsequently lead to dehydration. Also the vitamin c will slowly diminish in the water bottle and become ineffective.
To ensure your guinea pig is getting proper amounts of vitamin c through your current diet though there are a few things you can do.
Many websites for guinea pigs now have vitamin c veggie charts that show high and low levels of vitamin c veg which you can then look through to adapt the higher levels into your pigs diet.
Another thing is ensure your guinea pigs get fresh nuggets every day, do not just top up the bowl. Vitamin C levels in nuggets will lower the longer they are left in the air. So A nugget bowl should be emptied and filled daily with nuggets that have been kept in a sealed container.
I’m not sure why you want to fatten up your pigs? but i’d say your better of with normal oats if you wish to do so as said above
Although these can get stuck on guinea pigs teeth and cause a choking hazard so be careful
When it comes to guinea pigs weights there is no ideal, and some pigs are just naturally slim and athletic, one of my pigs is a 900g adult male and he’s healthy, where as my other pig weighs over 3.4lbs now and he is equally as healthy and fed on the same diet. I think it’s just to do with their metabolic rate and such.
