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It may have the following health benefits:

Inhibit tumour development. A study in 1987 found that stearic acid can inhibit tumour development in rats. (7)
Benefits breast cancer. A 2010 research showed that dietary stearate may be helpful in preventing or treating breast cancer. (8)
Decrease Cardiovascular Risks. A study in 2018 said that C16:0 increased cardiovascular and cancer risk while C18:0 (stearic acid) can decrease both. (9)

http://www.chinafooding.com/Stearic_Acid

Sodium Saccharin was first performed in 1879 by Constantin Fahlberg chemists dedicated to coal-tar derivatives, sodium saccharin Universal Johns Hopkins. In his study found a strong chance sodium accharins sweet. In 1884, Fahlberg patented in several countries, as he describes Sodium Saccharin method of making, he also said that saccharin. Sodium saccharin is only really popular in the sugar shortage during World War I, even if the Sodium Saccharin released to the public shortly after the discovery of saccharins sodium. Sodium Saccharin has become more popular. 1960s and 1970s. Sodium dieters saccharinh such as Sodium Saccharin is a calorie, colesteral free equipment. Sodium Saccharin is commonly found in restaurants and grocery stores in the pink bag in the popular brand "SweetN low." The drink contains a large number Sodium Saccharin, such as the popular Coca-Cola,Sodium Saccharin was introduced in 1963 as a diet cola drinks.
http://www.chinafooding.com/Sodium_Saccharin

Saccharin or saccharine, the oldest but controversial artificial sweetener, which has been used as a low-calorie sweetener and sugar substitute in food and beverage for more than 100 years with the European food additive number E954.

With the advantage of lower price and heat stability (250°C, thus suitable for cooking and baking), it was widely used in food and beverage. However, its food uses are not as popular as it used to be, but its market in toothpaste is big.

China exported around 15,000MT saccharin and its salts in 2019, and the USA imported about 900MT from the global market.

There are three problems with this sweetener:

Bitter taste
Considering its association with bladder cancer in studies in the 1970s (although authorities have demonstrated no such relationship in 2000), its application is limited and with the ADI of 15 milligrams per kilogram body weight per day (mg/kg bw/d) (1)
Environmental pollution from the manufacturing process
Let’s see more about this ingredient. Commonly we say saccharin refers to sodium saccharin, which is the common form of saccharin that is used in food and toothpaste.

http://www.chinafooding.com/Sodium_Saccharin

Stevia is stable to acid, alkali, heat, light, rather than fermentation. Stevia as a sweetener for beverages and food, quality assurance can be inhibitory and protrat expired. In addition,Stevia almost 60% reduction in the cost of production, transportation and warehousing costs can be saved at the same time.
Stevia as a food additive has been used for more than 400 years in Paraguay. Stevia Extract not involved in metabolism, no toxicity, which is by the FAO and WHO. Fooding As Stevia Extract Manufacturers approved, Stevia is very safe.
http://www.chinafooding.com/Stevia

Generally, the purifying rebaudioside A from a mixture of stevia glycosides of the stevia plant is similar with that of extracting stevioside.

The following brief manufacturing process of high purity Reb-A (98%) is from China manufacturer, Qufu Xiangzhou (1):

The leaves of stevia rebaudiana bertoni are first dried, crushed, and extracted in hot water. The extract is a dark solution containing stevia glycosides, along with impurities such as leaf pigments and pectin.

Treated the extract with ferric chloride and calcium oxide to precipitate impurities, and follow filtration. Passed the filtrate through an adsorption resin to trap the steviol glycosides.

Subsequently, wash the resin with ethanol to release steviol glycosides and then pass the ethanol extract through ion exchange resin for desalination, and then go through a decolorization process with activated carbon. Then follows the process of drying, concentration and decolorization. Finally, obtain rebaudioside A by spray drying.

As other stevia glycosides have very similar chemical structures – the same backbone steviol, so it is difficult to obtain high purity reb A.

http://www.chinafooding.com/Stevia