French pharmaceutical giant Sanofi could potentially invest somewhere between €1.3 billion and €1.5 billion in its Frankfurt manufacturing site making the insulin brand, Lantus, according to German newspaper Handelsblatt and Reuters. Sanofi had revealed that it was originally thinking about moving its Lantus manufacturing operations to France, but has opted to upgrade its German site instead. Although Sanofi has not provided much information on this investment, it would be a boost for a Germany economy, which has been struggling for several months with high interest rates, a soaring cost of li…