Add 5 LBS. Of Solid Flesh In 1 Week!

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"Girls with “Naturally Skinny” Figures …AMAZED AT THIS ENTIRELY NEW WAY TO ADD 5 LBS. OF SOLID FLESH IN 1 WEEK…OR NO COST! ..."
... THOUSANDS of thin, pale, rundown folks—and even “Naturally Skinny” men and women—are amazed at this new, easy way to put on healthy needed pounds quickly. Gains of 15 to 20 lbs. in one month—5 lbs. in one week—are reported regularly.
Kelp-a-Malt, the new mineral concentrate from the sea—gets right down to the cause of thin, underweight conditions and adds weight through a “3 ways in one” natural process. ..."

Note: 5 lbs is a little less than 2,5 kg

Kelp-O-Malt: Skinny Girls (Nov 1934) at Modern Mechanix.