For as little as 5¢ a day

Undated leaflet. No zip code, so we at least know it's pre-1963.

Proof positive of efficacy—

While it's unknown how this stacks up against Vegemeatavitamin, the product does measure itself against your classic American foodstuffs.

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What I find searching the Ritamine name are several FDA Notices of Judgment from the 1940s. In those cases, products and sales leaflets originating from American Dietaids in Yonkers were seized from health food stores in different cities. This one is from the Southern District of California in November 1944. The February 1945 disposition:

... the case having been removed to Eastern District of New York pursuant to agreement, judgment of condemnation was entered and it was ordered that the booklets be destroyed and that the remaining merchandise be released under bond for relabeling under the supervision of the Food and Drug Administration.

The FDA records reproduce the claims made by each manufacturer charged with violations, so those are an interesting look at hucksterism of the period. In the Ritamine case, more than a page worth of leaflet text is offered. Although text was typical of its kind, an additional contemporary pitch was used. After all, consumers needed all possible help for meeting the stress of wartime living—

Ritamine cases I saw from other years also were charged as labeling violations, and dispositions may have amounted mainly to wrist slaps. It may have been that the product was later produced under a change of company name, in a state other than New York. Or perhaps it was just a matter of these kinds of promises following patterns, so that other marketers recycled the product name at a later time.