Biogel or Biopolymer can cause secondary problems and thus I would avoid these as alternatives to calf implants.
Is Hydrogel or PMMA Safe to Use on the Calves, Lower Legs and Ankles to Make Them Bigger?
Doctor Answers 4
Calf implants for calf augmentation
Absolutely positively not ever never too many problems! Not FDA approved. Legs do well with calf implants.
Hydrogel is not approved in the US.
Many problems have been reported with hydrogel in Europe and Japan.
Consider fat transfer
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PMMA and hydrogel injections to calves
They will harden and are almost impossible to remove.
It is better to have nothing done than to cause yourself life-long problems.