L Carnitine L Tartrate specifically stacks well with S4 because LCLT helps upregulate androgen receptors which will may clear up receptors for better binding with the S4 and may even increase the number of receptors, I also like stacking divanil with LCLT but I think the unbound free test may compete with the S4 at the AR so it may be better not to stack them together although I am just guessing and is not a proven fact.
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